Relative humidity and dewpoint temperature provide the same exact information and can beused interchangeably. Select one: True False Which statement best defines the convention for identification of wind direction? Select one: a. the direction from which the wind is blowing b. the direction toward which the wind blowing c. the average direction the wind blew from during the past hour d. the expected wind direction during the next hour Under the right conditions, graupel can grow into hail by collecting supercooled water droplets. Select one: True False A typical extratropical cyclone has a diameter on the order of 1000 miles, nearly half the size of the U.S. Select one: True False What term describes the force per unit area applied by water vapor molecules only? Select one: a. vapor pressure b. relative humidity c. dewpoint temperature d. saturation vapor pressure A north wind means that the wind is blowing from: Select one: a. the south to the north b. the north to the south c. the east toward the north pole d. higher pressure toward lower pressure in the Northern Hemisphere. Which of the following is not considered to be a basic property of the atmosphere? Select one: a. pressure b. temperature c. moisture content d. wind [speed and direction] e. wind chill Miami has a temperature of 80°F and a dewpoint temperature of 55°F. Boston has a temperature of 15°F and a dewpoint temperature of 13°F. Which statement is incorrect concerning these two cities? Select one: a. Miami has the higher vapor pressure. b. Miami has the higher relative humidity. c. Boston has less water vapor in the atmosphere. d. Miami has the higher saturation vapor pressure. e. Miami and Boston have very different values of relative humidity. The type of turbulence that develops when wind speed changes rapidly with height is: Select one: a. thermal turbulence b. political turbulence c. adiabatic turbulence d. mechanical turbulence e. shear-induced turbulence Friction acts to slow down the wind and is a significant force throughout the entire troposphere. Select one: True False What is the term used to describe a narrow band of strong winds encircling the Earth in middle-latitudes? Select one: a. cyclone b. jetstream c. jetstreak d. storm system Albert Einstein first stated the physical laws governing motion, including air motion. Select one: True False The atmosphere is typically in hydrostatic balance everywhere except which location? Select one: a. at the poles b. at the equator c. in thunderstorms d. in strong high-pressure systems What is the ultimate driver of Earth’s weather? Select one: a. the Sun b. the jetstream c. the tilt of the Earth d. land/ocean distribution Trees, buildings and terrain features all deflect air in different directions, mixing air down from aloft and up from the surface, resulting in thermal turbulence. Select one: True False ________________________________ If a person wanted to estimate the value of relative humidity, which two variables could she compare? Select one: a. air temperature and saturation vapor presure b. air temperature and sea level pressure c. air temperature and dewpoint temperature d. dewpoint temperature and relative humidity e. dewpoint temperature and sea level pressure What are clouds composed of? Select one: a. water vapor b. ice crystals c. liquid water droplets d. Both b and c are correct. e. a, b, and c are all correct The pressure at the top of the Sears Tower in Chicago is lower than the pressure at the bottom of the Tower. Select one: True False During which phase changes is latent heat released into the atmosphere? Select one: a. melting and freezing b. evaporation and melting c. condensation and freezing d. evaporation and condensation What unit of pressure is most commonly used by meteorologists? Select one: a. millibar [mb] b. inches of mercury [in Hg] c. pounds per square inch [lb/in2] How does the average speed of air molecules influence the atmosphere? Select one: a. It determines the air temperature. b. It indicates the presence of clouds. c. It indicates if there will be precipitation. d. It determines what the relative humidity is. Which statement best defines the convention for identification of wind direction? Select one: a. the direction from which the wind is blowing b. the direction toward which the wind blowing c. the average direction the wind blew from during the past hour d. the expected wind direction during the next hour The atmosphere is in hydrostatic balance if the vertical pressure gradient force exactly balances the downward Coriolis force. Select one: True False Where is the pressure gradient force directed from higher pressure toward lower pressure? Select one: a. only at the equator b. at all places on earth c. only in the Northern Hemisphere d. only in the Southern Hemisphere e. at all places on earth except for the equator The _________ is an apparent force associated with the rotation of the earth. Select one: a. Coriolis force b. frictional force c. gravitational force d. vertical pressure gradient force e. horizontal pressure gradient force The pole to equator temperature gradient is much stronger in winter than in summer. Therefore, the jetstream aloft will generally be much stronger in winter than in summer. Select one: True False All air on Earth has angular momentum, except for what location(s)? Select one: a. the north pole b. the south pole c. the equator d. Both a and b are correct. e. a, b, and c are all correct. Pressure varies in the vertical from 1013.25 mb at Earth’s surface (on average) to what value near the tropopause? Select one: a. ~300 mb b. ~30 mb c. ~3 mb d. ~0.3 mb Hydrostatic balance is achieved when which two forces are balanced? Select one: a. friction and gravity b. vertical pressure gradient force and gravity c. horizontal pressure gradient force and friction d. horizontal pressure gradient force and Coriolis force Which statement is not correct? Select one: a. Friction always reduces the wind speed. b. Friction leads to the strengthening of surface low-pressure centers. c. Friction leads to a deflection to the left of the geostrophic wind direction, toward the low pressure side of isobars. d. Friction always acts to turn the wind such that the flow has a component from higher pressure toward lower pressure. e. Friction influences air flow up to roughly 3 km above the surface. Divergence removes mass from a column of air while convergence adds mass to a column of air. Select one: True False The divergent quadrants of a jetstreak are the left entrance and right exit regions. Select one: True False Which of the following can enhance surface high-pressure systems? Select one: a. Convergence in the right exit region of a jetstreak b. Convergence due to curvature in the jetstream. c. The cooling of the air in the vicinity of the high. d. a and b are both correct. e. a, b, and c are all correct. The divergent quadrants of a jetstreak are its ________ and ________ quadrants. Select one: a. left entrance; left exit b. left entrance; right exit c. right entrance; left exit d. right entrance; right exit e. right entrance; left entrance If an air column is cooled through radiational cooling, what will happen to the surface pressure? Select one: a. It will increase. b. It will decrease. c. It will stay the same. d. It will become unbearable. The effect of changing flow curvature in the jetstream is to create ________ downstream of the ridge axis and ________ downstream of the trough axis. Select one: a. divergence; divergence b. divergence; convergence c. convergence; divergence d. convergence; convergence Which of the following would typically be the coldest airmass? Select one: a. continental tropical (cT) b. maritime tropical (mT) c. maritime polar (mP) d. continental polar (cP) It is May on the Great Plains. A cold front is advancing toward you. What type of weather conditions would you expect to find if the cold front is advancing into warm, moist, conditionally unstable air? Select one: a. thunderstorms b. widespread fog c. freezing rain and sleet d. clear skies It is May on the Great Plains. A cold front is advancing toward you. What type of weather conditions would you expect to find if the cold front is advancing into warm, moist, stable air? PAGE 158 Select one: a. thunderstorms b. widespread fog c. freezing rain and sleet d. clear skies light rain or no rain at all. Along a stationary front, air on the cold side of the front always moves in what direction? Select one: a. upwards b. perpendicular to the front c. parallel to the front d. to the south Flooding can be a significant hazard associated with stationary fronts. Select one: True False Clouds that develop along warm fronts typically are layered in nature and any precipitation tends to be more widespread and steady. Select one: True False Extratropical cyclones are ultimately destroyed by precipitation. Select one: True False Cooling a column of air causes the surface pressure to lower. Select one: True False What type of surface pressure systems are typically associated with fair weather? Select one: a. high pressure b. low pressure c. both high and low pressure are associated with fair weather Convergence throughout an entire air column is associated with increasing surface pressure. Select one: True False Air flows cyclonically around low-pressure centers. Select one: True False Air moving in a straight line that decelerates will lead to the development of a region of convergence over the area of deceleration. Select one: True False Divergence removes mass from a column of air while convergence adds mass to a column of air. Select one: True False Friction: Select one: a. increases wind speed at the surface. b. is most important in the upper troposphere. c. decreases surface wind speeds, ultimately leading to air flowing toward surface lowpressure centers. d. exists between you and your sweetheart because you forgot Valentines Day. If you examine a surface map and discover that there is a region where cold air is retreating and warm air is advancing toward it, you would classify this as what meteorological feature? Select one: a. an airmass b. a stationary front c. a warm front d. a cold front + Which dimension does not match a possible depth of airmass? Select one: a. from the surface to the tropopause b. 5 kilometers (~ half the depth of the troposphere) c. 1 to 2 kilometers d. 1 to 2 meters Which of the following can enhance surface low-pressure systems? Select one: a. divergence in the left exit region of a jetstreak b. convergence due to curvature in the jetstream c. the cooling of the air in the vicinity of the low d. a and b are both correct. e. None of the above are correct. Over land, the turning of air across isobars due to friction is on the order of 80 to 90 degrees. Select one: True False 1. the following four questions, match the arrows drawn below for the set of 500 mb isoheights with their correct forces or winds: direction of the pressure gradient force B direction of the geostrophic wind in the Southern Hemisphere A direction of the geostrophic wind in the Northern Hemisphere C direction of the Coriolis force (assuming geostrophic balance) D The image below shows the 500 mb map from 6:00 a.m. Tuesday morning (January 28) when wintry precipitation was occurring just to the south of Monroe. The solid black lines on the map are the isoheights and the green shading represents higher values of relative humidity at 500 mb. Complete the following questions about the 500 mb map given below: Rank the states given below from 1-4 by the state with the largest (or strongest) pressure gradient ("1") to the state with the smallest (or weakest) pressure gradient ("4") represented by the slope of the isoheights implied above. Oregon 5700 1 STRONGEST weakest Pennsylvania 5160 4 WEAKEST strongest Utah 5640 3<< Louisiana 5580 2<< Using the the 500 mb map given above in #2, indicate the direction wind is blowing FROM in each of the following places by circling the best answer: eastern Montana North Colorado Northwest Vermont Southwest Missouri West Using the the 500 mb map given above in #2, rank the states given below from 1-4 by the state with the strongest winds ("1") to the state with the weakest winds ("4"). Minnesota 4 weakest Montana 3 Maine 1 strongest Arkansas 2 Which statement about the picture shown below is NOT correct? Select one: a. There is a low pressure system at the surface. b. There are upward motions throughout the troposphere. c. Surface pressures should increase over time. d. The pressure system will strengthen over time. In what state would rainfall be least likely (Hint: Which state is under a ridge of high pressure?)? Select one: a. Louisiana b. Kansas c. Virginia Melissa J. Hinton ATMS 1002 Synthesis Activity 3 Chapter 1--Temperature 1. Temperatures _______________ with height up to 12 km, they _______________ once they reach over 12 km up to 50 km. Once they reach over 50 km they _______________ again. Temperatures increase near the borders of outer space. A. decrease; increase; increase B. increase; decrease; increase C. decrease; increase; decrease (pg. 4) D. increase; increase; increase E. They all vary each day depending on the weather patterns. Chapter 8—Curved Flow 1. In curved flows around the high-pressure, the true flow will be _______________ than its geostrophic value. A. slower B. the same (pg. 141) C. faster D. none of the above Chapter 12—Vertical Structure of the Atmosphere during Freezing Precipitation 1. _______________ create(s) freezing precipitation when the snow falls from high in the clouds into an atmospheric level where the temperatures exceed 0°C. A. supercooled warm rain process B. melting levels C. freezing drizzle D. freezing rain E. none of the above (pg. 209—melting process) Chapter 11—Gulf Coast Cyclones 1. Which climatic change is taking place when subtropical jetstreams are stronger due to the surface sea temperatures and moisture in the tropical atmosphere? B. Tornado C. Hurricane D. E. Cyclone Chapter 15—Extreme Event—The Winter of Blizzards 1. Which state(s) have had the worst blizzard(s) on record? A. South Dakota B. New York C. Minnesota D. North Dakota E. Both B & C F. Both A & D (pg. 263) Which dimension does not match a possible depth of airmass? Select one: a. from the surface to the tropopause b. 5 kilometers (~ half the depth of the troposphere) c. 1 to 2 meters d. 1 to 2 kilometers It is May on the Great Plains. A cold front is advancing toward you. What type of weather conditions would you expect to find if the cold front is advancing into warm, moist, conditionally unstable air? Select one: a. freezing rain and sleet b. clear skies c. thunderstorms d. widespread fog Which of the following statements about dry lines is false? Select one: a. Dry lines are found most commonly east of the Mississippi River. b. A dry line is a front that is characterized by a sharp moisture difference between two airmasses. c. Dry lines develop when air flowing eastward from the high desert plateau regions of the United States descends the Rockies into the southern Plains. d. Thunderstorms tend to develop along dry lines in mid-afternoon. While historically ice storms have caused significant impact in the United States, since 2000 there have been very few. Scientists attribute this to global warming. Select one: True False The warm rain process of freezing precipitation formation refers to the fact that the air temperature is above freezing through most of the troposphere. Select one: True False In the central United States, most freezing precipitation is associated with arctic fronts and warm fronts. Select one: True False Ice pellets are another name for frozen raindrops; sleet is another name for snow. Select one: True False Freezing drizzle is most common in the northeast United States and eastern Canada, while freezing rain is most common on the High Plains of the central U.S. and Canada. Select one: True False Freezing drizzle typically results in minor glaze accumulations. Select one: True False One of the most destructive ice storms in North America occurred in January 1998 along the northeast U.S./Canadian border. One reason for this storm’s destruction was the prolonged duration (five days) of glaze accumulation. Select one: True False An “Alberta Clipper” is an extratropical cyclone that develops east of the Canadian Rockies and rapidly moves eastward, typically across the Great Lakes region. Select one: True False The Great Lakes region experiences many extratropical cyclones. Which of the following best describes why? Select one: a. The tracks of Rocky Mountain cyclones and Alberta Clippers converge over the Great Lakes. b. The Great Lakes is one the primary regions where extratropical cyclones initially develop. c. The Great Lakes attract cyclones because of the large amounts of moisture in the air. d. Both (a) and (b) are correct. e. Both (a) and (c) are correct. The tracks of extratropical cyclones that form east of the Rocky Mountains in Canada and the United States typically converge over the Great Lakes region. Select one: True False Which statement about Alberta Clippers is not accurate? Select one: a. Alberta Clippers form east of the Rocky Mountains. b. Alberta Clippers can produce up to 6 to 8 inches of snow. c. Alberta Clippers develop as divergence occurs at jetstream level in a wave. d. Alberta Clippers typically form in an environment where the air is very moist and warm. e. Alberta Clippers move rapidly across the United States/Canadian border to the Atlantic Ocean. Cyclones typically intensify as they move onto the Plains east of the Rockies. Why does this occur? Select one: a. The fronts all converge in the region of the low-pressure center. b. Winds converge into the low-pressure center at the surface due to friction. c. Warm air from over the Great Lakes moves into the cyclone increasing snowfall downwind of the lakes and increasing divergence aloft over the low. d. Warm air moves north to the east of the cyclone and cold air moves south to the west of the cyclone. This can lead to an intensification of the curvature and jetstreak effects aloft, increasing divergence over the low. e. All of the above contribute to a lowering of the surface pressure. ----------------------------------------------------------------------- When a dry line passes, winds typically shift from westerly before the dryline passes to easterly after the dryline passes. Select one: True False Which of the following statements about dry lines is false? Select one: a. A dry line is a front that is characterized by a sharp moisture difference between two airmasses. b. Thunderstorms tend to develop along dry lines in mid-afternoon. c. Dry lines are found most commonly east of the Mississippi River. d. Dry lines develop when air flowing eastward from the high desert plateau regions of the United States descends the Rockies into the southern Plains. Which dimension does not match a possible depth of airmass? Select one: a. 1 to 2 meters b. from the surface to the tropopause c. 1 to 2 kilometers d. 5 kilometers (~ half the depth of the troposphere) The two fronts that produce most of the freezing precipitation on the plains between the Rocky Mountains and the Appalachian Mountains are: Select one: a. occluded fronts and dry lines. b. arctic fronts and warm fronts. c. upper level fronts and dry lines. d. upper level fronts and cold fronts. e. back door cold fronts and coastal fronts. Since freezing rain is produced primarily by thunderstorms, a sounding taken during freezing rain must show conditional instability. Select one: True False During an ice storm, __________winds will worsen the situation by __________. Select one: a. strong; causing ice burdened structures to fail b. strong; blowing the glaze accumulation to other nearby areas c. weak; concentrating the ice accumulation in a localized area d. None of the above are correct. Wind cannot impact the destruction of an ice storm. Aircraft icing is most dangerous in freezing drizzle situations because the entire cloud in which the aircraft is flying may consist of supercooled water. Select one: True False Cold air trapping often leads to freezing rain in which geographic region(s)? Select one: a. The Great Basin b. Appalachian mountain valleys c. The Colorado River valley d. The Columbia River valley e. Both b and d are correct. One of the most destructive ice storms in North America occurred in January 1998 along the northeast U.S./Canadian border. One reason for this storm’s destruction was the prolonged duration (five days) of glaze accumulation. Select one: True False Freezing precipitation is generally found in a narrow (less than 100 mile wide) band on the cold side of the 0C isotherm at the Earth’s surface. Select one: True False Waves in the upper atmosphere are vital to the development and intensification of extratropical cyclones. When will a wave in the jetstream amplify? Select one: a. When warm air moves northward west of a low and cold air moves southward east of a low. b. When warm air moves southward west of a low and cold air moves northward east of a low. c. When cold air moves northward west of a low and warm air moves southward east of a low. d. When cold air moves southward west of a low and warm air moves northward east of a low. e. None of the above are correct. The amplification of an atmospheric wave has nothing to do with the transport of air of differing temperatures. Which of the following may occur when extratropical cyclones develop on the Plains east of the Rockies in early spring? Select one: a. A line of thunderstorms will often form ahead of the dry line or upper level front. b. A widespread area of moderate rain or snow will typically occur north of the warm front. c. Heavy snow will fall along the Rockies north of the low because cold air is rising along the topography in this region. d. Air will flow counterclockwise around the low. e. All of the above may occur. Several frontal boundaries can be present south of an extratropical cyclone located east of the Rocky Mountains. Which of the following statement(s) correctly describe(s) the types of weather that can occur in this region of the cyclone? Select one: a. A wide shield of clouds will be sometimes be present east of the upper level front with precipitation type changing from rain to freezing rain to sleet to snow as one goes from west to east. b. When the upper level front leads the dry line, there may be one line of storms along the upper level front and a second along the dry line if the low-level air is sufficiently heated during the daytime. c. Upslope flow will lead to a wide region of snowfall along the Rocky Mountains in this quadrant of the cyclone. d. The intensity of the precipitation and the potential for severe weather will depend on the stability of the warm moist air and how the winds change with height in the warm air ahead of the leading front. e. b and d are both correct. The Great Lakes region experiences many extratropical cyclones. Which of the following best describes why? Select one: a. The tracks of Rocky Mountain cyclones and Alberta Clippers converge over the Great Lakes. b. The Great Lakes is one the primary regions where extratropical cyclones initially develop. c. The Great Lakes attract cyclones because of the large amounts of moisture in the air. d. Both (a) and (b) are correct. e. Both (a) and (c) are correct. The tracks of extratropical cyclones that form east of the Rocky Mountains in Canada and the United States typically converge over the Great Lakes region. Select one: True False Upslope flow 179 263 Storms 282 283 To understand ice storms, we must first understand _______________. Select one: a. Glaze b. Inversion c. Melting Level d. Supercooled Water Which of the following is NOT a primary location of bomb cyclones to form? Select one: a. U.S Gulf Coast b. U.S East Coast c. Western Pacific d. Mediterranean Sea The balance between the pressure gradient force and Coriolis force is known as the? Select one: a. force balance b. gradient force c. geostrophic balance d. hydrostatic balance The type of cloud that can be describes as "layered and widespread"? Select one: a. stratus cloud b. cumulonimbus cloud c. cumulus cloud d. cirrus cloud Narrow bands of strong winds at upper levels below the tropopause are Select one: a. Wind convergence b. Jet Streams c. Jet streaks d. Wind Divergence Simple rules of winter travel can save your life if you are trapped on the road in a blizzard. Travelers should ________________________ Select one: a. Carry basic winter automobile safety items b. Stay with your vehicle c. Carry a winter storm survival kit d. All of the above The term "overrunning" referees to the action of? Select one: a. cold air falling downwards over warm air b. none of the above c. warm and cold are colliding d. warm air rising upwards over cold air A high value of air temperature corresponds to a low saturation vapor pressure. Select one: True False When a cloud dissipates, _________ is taking place. Select one: a. freezing b. melting c. evaporation d. snowfall e. condensation How does the average speed of air molecules influence the atmosphere? Select one: a. It determines the air temperature. b. It indicates the presence of clouds. c. It indicates if there will be precipitation. d. It determines what the relative humidity is. The atmosphere is in hydrostatic balance if the vertical pressure gradient force exactly balances the downward Coriolis force. Select one: True False A front is a narrow region with similar temperature characteristics directly under a jetstream in the upper troposphere. Select one: True False If the earth did not rotate, the Coriolis force would be: Select one: a. strongest at the poles and zero at the equator. b. strongest at the equator and zero at the poles. c. strong and negative everywhere on earth. d. zero everywhere on earth. The atmosphere contains large numbers of invisible tiny particles called _____________. Select one: a. Deposition b. Haze c. Aerosol Which of the following regions is not a preferred area for cyclone formation? Select one: a. Over the Pacific Ocean in the Gulf of Alaska b. Over of the Great Lakes c. East of the Rocky Mountains in Colorado d. Near the North Carolina coast e. Along the Texas-Louisiana coastline of the Gulf of Mexico The balance between the pressure gradient force and Coriolis force is known as the? Select one: a. force balance b. geostrophic balance c. hydrostatic balance d. gradient force In general, a(n) ________________ front is likely to be present if a sharp line of storms exists with clear air to the west of the line and if no significant change in the temperature or dew point temperature appears at the surface across the line of storms. Select one: a. Stationary b. Warm c. Upper-Level d. Cold At what temperature (Celsius) does snow fall through the melting level and continue to fall on the ground as rain? Select one: a. -10'c b. 0'c c. 2'c d. 13'c Which statement about the tropopause is incorrect? Select one: a. The tropopause acts as a lid on weather. b. The tropopause slopes downward from the tropics to the poles. c. The tropopause is the boundary between the troposphere and the stratosphere. d. The tropopause is where pressure stops decreasing with height and starts increasing with height. e. The temperature at the tropopause is typically colder than the temperature at the surface. Which of Newton’s laws relates the force exerted on an object to its acceleration? Select one: a. First law of motion b. Second law of motion c. Third law of motion The ___________ causes air to slow down near the surface. Select one: a. Coriolis force b. frictional force c. gravitational force d. vertical pressure gradient force e. horizontal pressure gradient force Which term is defined by the rate at which pressure changes with distance? Select one: a. pressure gradient b. pressure contour c. pressure unit area d. pressure isoheight Occluded fronts form as a _________ overtakes a(n) _________ . cold, warm Choose which frontal passage below best corresponds to the following forecast: “Warm temperatures, sunny skies and southerly winds will prevail today. Thundershowers expected this evening followed by a rapid drop in temperature and winds shifting to northwesterly.” Select one: a. occluded front b. cold front c. warm front d. dryline Clouds that develop along warm fronts typically are layered in nature and any precipitation tends to be more widespread and steady. Select one: True False Freezing precipitation is generally found in a narrow (less than 100 mile wide) band on the cold side of the 0C isotherm at the Earth’s surface. Select one: True False If you become stranded in your car during a blizzard, which of the following is your best course of action? Select one: a. Get out of your car immediately and walk to the nearest house. b. Get out of your car, light danger flares at distances of 50 and 100 yards away to signal for help, and return to your car. c. Call for help if you have a cell phone and light a candle and wait while huddled in warm clothes and blankets. d. Run the engine so that the car's heater can keep you warm. Which of the following factors is (are) included in the wind chill? Select one: a. wind speed b. temperature and wind speed c. wind speed and evaporation d. evaporation e. temperature Which of the following is NOT an "ingredient" of a severe blizzard? Select one: a. low relative humidity b. extremely cold air c. falling or blowing snow d. strong winds What is the term used to describe blizzards caused solely by blowing snow? Select one: a. white powder b. diamond dust c. ground blizzards d. white blizzards e. snow blizzards The National Weather Service Issues a blizzard warning when falling or blowing snow is accompanied by winds exceeding what speed? Select one: a. 40 knots b. 35 knots c. 30 knots d. 50 knots Extratropical cyclones: Select one: a. transport warm air northward and upward. b. transport cold air southward and downward. c. deposit latent heat (due to precipitation ) into the atmosphere. d. All of the above are correct. e. None of the above are correct. The Great Lakes region experiences many extratropical cyclones. Which of the following best describes why? Select one: a. The tracks of Rocky Mountain cyclones and Alberta Clippers converge over the Great Lakes. b. The Great Lakes is one the primary regions where extratropical cyclones initially develop. c. The Great Lakes attract cyclones because of the large amounts of moisture in the air. d. Both (a) and (b) are correct. e. Both (a) and (c) are correct. All extratropical cyclones affecting the Midwestern United States form in the lee of the Rocky Mountains. Select one: True False Cyclones typically intensify as they move onto the Plains east of the Rockies. Why does this occur? Select one: a. The fronts all converge in the region of the low-pressure center. b. Winds converge into the low-pressure center at the surface due to friction. c. Warm air from over the Great Lakes moves into the cyclone increasing snowfall downwind of the lakes and increasing divergence aloft over the low. d. Warm air moves north to the east of the cyclone and cold air moves south to the west of the cyclone. This can lead to an intensification of the curvature and jetstreak effects aloft, increasing divergence over the low. e. All of the above contribute to a lowering of the surface pressure. Several frontal boundaries can be present south of an extratropical cyclone located east of the Rocky Mountains. Which of the following statement(s) correctly describe(s) the types of weather that can occur in this region of the cyclone? Select one: a. A wide shield of clouds will be sometimes be present east of the upper level front with precipitation type changing from rain to freezing rain to sleet to snow as one goes from west to east. b. When the upper level front leads the dry line, there may be one line of storms along the upper level front and a second along the dry line if the low-level air is sufficiently heated during the daytime. c. Upslope flow will lead to a wide region of snowfall along the Rocky Mountains in this quadrant of the cyclone. d. The intensity of the precipitation and the potential for severe weather will depend on the stability of the warm moist air and how the winds change with height in the warm air ahead of the leading front. e. b and d are both correct. Which of the following regions is not a preferred area for cyclone formation? P 173 Select one: a. over of the Great Lakes b. near the North Carolina coast c. east of the Rocky Mountains in Colorado d. over the Pacific Ocean in the Gulf of Alaska e. along the Texas-Louisiana coastline of the Gulf of Mexico Waves in the upper atmosphere are vital to the development and intensification of extratropical cyclones. When will a wave in the jetstream amplify? Select one: a. When warm air moves northward west of a low and cold air moves southward east of a low. b. When warm air moves southward west of a low and cold air moves northward east of a low. c. When cold air moves northward west of a low and warm air moves southward east of a low. d. When cold air moves southward west of a low and warm air moves northward east of a low. e. None of the above are correct. The amplification of an atmospheric wave has nothing to do with the transport of air of differing temperatures. An “Alberta Clipper” is an extratropical cyclone that develops east of the Canadian Rockies and rapidly moves eastward, typically across the Great Lakes region. Select one: True False Which statement about Alberta Clippers is not accurate? Select one: a. Alberta Clippers form east of the Rocky Mountains. b. Alberta Clippers can produce up to 6 to 8 inches of snow. c. Alberta Clippers develop as divergence occurs at jetstream level in a wave. d. Alberta Clippers typically form in an environment where the air is very moist and warm. e. Alberta Clippers move rapidly across the United States/Canadian border to the Atlantic Ocean. Which statement about upslope flow and extratropical cyclones is correct? Select one: a. The Rocky Mountains enhance upslope flow associated with cyclones. b. Upslope flow is typically found south of a cyclone center in the region of strong thunderstorms. The Great Lakes region experiences many extratropical cyclones. Which of the following best describes why? Select one: a. The tracks of Rocky Mountain cyclones and Alberta Clippers converge over the Great Lakes. b. The Great Lakes is one the primary regions where extratropical cyclones initially develop. c. The Great Lakes attract cyclones because of the large amounts of moisture in the air. d. Both (a) and (b) are correct. e. Both (a) and (c) are correct. c. The region of a cyclone that experiences upslope flow may also develop strong winds and cold temperatures d. Both a and b are correct. e. Both a and c are correct. Black ice is difficult to see on a road because of either dirt within the ice or because it is not visible on the road due to being covered by accumulating snow or difficult to see at night. Select one: True False Blizzards of which type of cyclone typically have larger snowfall totals? Select one: a. Colorado cyclone b. Alberta Clipper Identify the area of the US/Canada why would be most likely to be experiencing blizzard conditions. Northwest Is this an example of an Alberta Clipper or Colorado Cyclone? Colorado cyclone Blizzards associated with Alberta Clippers typically have colder temperatures than blizzards associated with cyclones that form east of the Colorado Rockies. In a blizzard, it is likely that exposed skin will feel colder than the wind chill temperature due to melting and evaporation of snow and water on the skin. In Rocky Mountain cyclones, blizzards occur under the “wrap around” part of the comma cloud which meteorologists refer to as the trowal Blizzards associated with Alberta Clippers typically produce less snow than blizzards associated with cyclones that form east of the Colorado Rockies. The map above shows the track of a strong cyclone at 12-hour intervals that brought snowfall and hazardous winter weather conditions to the eastern United States. Using your knowledge of airflow around a cyclone, determine the wind direction (NE, SE, SW, NW) at locations A, B and C at the times listed . Location A on 15 Feb 0000 UTC NW SW SE NORTHEAST Location A on 14 Feb 0000 UTC SW NW NE SOUTHEAST Location C on 14 Feb 1200 UTC NE SE SW NORTHWEST Location B on 14 Feb 1200 UTC NE SE SW NORTHWEST Location B on 14 Feb 0000 UTC SW NW NE SOUTHEAST Location B on 15 Feb 1200 UTC SE NE NW SOUTHWEST Location B on 15 Feb 0000 UTC NW SW SE NORTHEAST Location A on 14 Feb 1200 UTC NE SE SW NORTHWEST Location C on 15 Feb 0000 UTC NW SW SE NORTHEAST NW>SW SW>NW Which of the following is not helpful in obtaining data about the conditions of the atmosphere? Select one: a. ships b. long-range trucks c. commercial aircraft Commercial aircraft collect weather data during flight that is utilized by meteorologists at the National Weather Service. Select one: True False What is the amount of infrared energy sensed by a GOES satellite related to? Select one: a. The solar radiation reflected by the surface. b. The solar radiation absorbed by the surface.???? c. The emission of energy from only water molecules. d. The temperature of the highest surface (cloud top or ground) visible from the satellite. To obtain measurements over the ocean, thousands of buoys have been deployed, each with the capability of launching rawinsondes without human assistance. Select one: True False??? The United States is the only country in the world that has weather satellites. Select one: True False Where is the Lightning Detection Network currently installed? Select one: a. in the Central Plains b. across the entire United States c. in the mountainous regions of the West Pressure on a surface station model is coded only if it is outside of the range of 980 mb to 1040 mb. Select one: True False A vertical cross section through a thunderstorm might help identify the storm's updraft as well as regions of hail. Select one: True False The contours on an upper level chart depict the altitude of a pressure surface. Select one: True False The Internet has made access to maps easier and required meteorologists to adopt a standard plotting format so all maps look the same. Select one: a. true b. false Numerical weather prediction models cannot be used to study specific severe weather phenomenon such as tornadic thunderstorms or hurricanes because these storms are still too complicated for current computer technology. Select one: True False In general, which forecasts would you expect to be most accurate, all things being equal? Select one: a. short-range forecasts b. medium-range forecasts c. long-range outlooks d. All forecasts have the same accuracy. What type of forecast would provide the most useful information in predicting phenomena such as El Niño and drought? Select one: a. short-range forecasts b. medium-range forecasts c. long-range outlooks Approximately how long does it take a team of scientists to develop an operational computer model for weather forecasting? Select one: a. 1 day b. 6 months c. 1 year d. several years e. several decades At 0000 UTC 14 December, the actual date in the United States is still 13 December. Select one: True False The infrared channel on a GOES satellite can be used to estimate the temperature of cloud tops. Select one: True False While satellites are able to detect several wavelengths of radiation, human eyes can only detect visible wavelengths of radiation. Select one: True False The brightest regions on a or an __________ satellite image are associated with the coldest clouds or surfaces. Select one: a. visible b. infrared c. water vapor Geostationary weather satellites are placed in orbit over the equator at a distance of how many miles above the Earth’s surface? Select one: a. about 100 miles b. about 1000 miles c. about 22,000 miles d. 1000 to 5000 miles, depending on season. e. None of the above are correct. While information on the location of cloud-to-ground lightning strikes would be beneficial to forecasters, currently there no such system exists that reliably measures the location of lightning strikes. Select one: True False Which of the following would be seen most easily by examining a cross section? Select one: a. the horizontal precipitation pattern at the surface along a front b. the cloud cover across the United States east of the Mississippi River c. the location of troughs approaching the west coast of the United States d. the distribution and gradient of temperature in a severe storm from the cloud base to the tropopause A vertical cross section shows the conditions of the atmosphere at one particular location across the span of several days. Select one: True False The contours on an upper level chart depict the altitude of a pressure surface. Select one: True False What type of weather product allows meteorologists to visualize the vertical structure of fronts, clouds, and jet streams? Select one: a. upper air map b. cross section c. sea level pressure map d. all of the above One reason research models are seldom used for operational weather forecasting is that the research simulations take too long to complete to be useful in a forecast. Select one: True False Mesoscale models are not typically used for operational weather forecasting because the availability of observational data to resolve the initial state is inadequate. Select one: True False Which of the following weather phenomena would typically not be simulated using a mesoscale research model? Select one: a. tornado b. drought c. hurricane d. thunderstorm A thunderstorm’s anvil is: Select one: a. composed of ice crystals. b. not as wide as the base of a thunderstorm. c. symmetrically shaped if the vertical wind shear is strong. d. the region where the thunderstorm’s strongest downdraft is located. Frontal squall lines trigger new thunderstorms as the front advances into the warm moist air ahead of the front. Select one: True False Supercell thunderstorms account for most tornadoes, virtually all severe tornadoes, damaging straight-line winds and most large hail. Select one: True False On radar, the bounded weak echo region of a supercell thunderstorm is where the volume of the cloud has weak radar echoes and appears structurally similar to a gothic cathedral vault. Select one: True False What type(s) of thunderstorms is (are) responsible for much of the summer rainfall on the Central Plains? Select one: a. frontal squall line thunderstorms b. airmass thunderstorms c. supercell thunderstorms d. mesoscale convective system thunderstorms e. all thunderstorm types Frontal squall lines make up the “head” of a comma cloud associated with an extratropical cyclone. Select one: True False Prior to the development of a supercell, there is often a temperature inversion in the lower troposphere. Select one: True False Within a supercell, the process of vortex stretching concentrates the rotation in a mesocyclone. Select one: True False Which statement about tornadoes is not correct? Select one: a. Exceptionally strong tornadoes can destroy steel-reinforced structures. b. Strong tornadoes can throw automobiles over 100 feet. c. On average, over 1,000 tornadoes are reported in the United States each year. d. Over the 12-year period ending in 2006, an average of around 50 people have been killed and roughly another 1000 injured in the United States annually by tornadoes. e. Over the 12-year period ending in 2006, tornadoes were responsible for over 100 billion dollars in property losses. Tornado Alley is located from Texas to Indiana. Why? Select one: a. This region aligns approximately with the typical orientation of strong cold fronts or dry lines as they move across the central United States. b. This region aligns with the typical orientation of the jet stream during supercell outbreaks. c. This region has the highest number of mobile home parks per capita. d. a and b are correct. e. a, b, and c are all correct. What law of physics is responsible for the concentration of rotation in a supercell thunderstorm? Select one: a. conservation of energy b. conservation of momentum c. conservation of kinetic energy d. conservation of angular momentum About 75 percent of all tornadoes occur in the United States. Select one: True False It is believed that a significant number of the smaller tornadoes that occur across North America each year are of what type? Select one: a. landspouts b. gustnadoes c. waterspouts d. cold air funnels What type of vortex rarely reaches the ground? Select one: a. gustnado b. dust devil c. landspout d. waterspout e. cold air funnel This type of vortex forms along the boundary of cool outflow ahead of a thunderstorm. Select one: a. gustnado b. dust devil c. landspout d. waterspout e. cold air funnel What is the speed of the strongest wind, and what pressure level is it located at? Select one: a. 50 knots, 150 mb b. 100 knots, 200 mb c. 100 knots, 150 mb d. 50 knots, 250 mb e. 50 knots, 200 mb f. 100 knots, 250 mb Question 4 Not yet answered Marked out of 1.00 Flag question Question text What is the wind speed and direction at 500 mb? Select one: a. out of the northeast at 20 knots b. out of the northeast at 40 knots c. out of the southwest at 20 knots d. out of the southwest at 40 knots Question 5 Not yet answered Marked out of 1.00 Flag question Question text Which layer is a cloud layer located at (where is the air saturated)? Select one: a. 900-950 mb b. 850-900 mb c. 950-1000 mb d. 800-850 mb What will happen if a parcel of air is displaced vertically in an unstable environment? Select one: a. It will remain in its new position. b. It will return to its original position. c. It will continue to accelerate away from its original position. d. None of the above. Air cannot be displaced vertically in the atmosphere. Question 8 Not yet answered Marked out of 1.00 Flag question Question text Which best describes an air parcel? Select one: a. a cloud b. a large area of rain c. a volume of air that moves around in the atmosphere intact d. the bubble of air sometimes seen on the top of thunderstorms Question 9 Not yet answered Marked out of 1.00 Flag question Question text Air lifted through the lifting condensation level will not necessarily become buoyant. The air must be lifted through its level of free convection before it will rise freely. Select one: True False Question 10 Not yet answered Marked out of 1.00 Flag question Question text If an air parcel is ________, it will ____________ at the moist adiabatic lapse rate. Select one: a. saturated; expand and cool b. saturated; expand and warm c. saturated; contract and cool d. unsaturated; expand and cool e. unsaturated; contract and cool The three primary channels used by satellites for imaging weather systems are AM (amplitude modulated), FM (frequency modulated), and Microwave (tuned to water vapor frequency). Select one: True False The brightest regions on a or an __________ satellite image are associated with the coldest clouds or surfaces. Select one: a. visible b. infrared c. water vapor The potential for damage from a falling hailstone increases with which of the following? Select one: a. the stone’s size b. the stone’s fall speed c. the horizontal windspeed d. all of the above What causes the milky white appearance of some hailstones? Select one: a. air bubbles trapped in the hailstone b. above normal atmospheric pressure c. pollution trapped in the thunderstorm cloud d. snowflakes trapped during hailstone growth What will likely happen to graupel particles that are located in the core of a strong thunderstorm updraft early in their growth phase? Select one: a. They will melt. b. They will become the largest hailstones. c. They will shatter into smaller fragments. d. They remain small because they will be swept into the upper part of the cloud. Which of the following cities is not in Hail Alley? Select one: a. Dallas b. Kansas City c. Oklahoma City d. New Orleans Which is not a possible characteristic of a hailstone? Select one: a. solid b. hard c. soft d. spongy e. A hailstone can have any of the above characteristics. What does a graupel particle generally have the consistency of? Select one: a. a marble b. a snowball c. a milk shake d. milk Why are the interior structure of hailstorms and the growth processes of hail difficult to study? Select one: a. Hailstorms move rapidly. b. Hailstones melt too rapidly to permit careful study. c. Storms containing hail cannot be distinguished by radar. d. Flying research aircraft through a hailstorm is dangerous. What is the current average lead time for tornado warnings? Select one: a. 0 minutes (no lead time) b. 2 minutes c. 6 minutes d. 12 minutes e. 27 minutes What are “storm spotters”? Select one: a. individual cloud tops that appear on infrared satellite just prior to tornadogenesis b. the red-colored radar echoes that appear on Doppler radar during tornadic thunderstorms c. meteorologists who watch the skies through the windows of the National Weather Service office d. trained volunteer citizens who monitor severe weather conditions from a pre-determined location On what type of weather product would you be able to identify the mesocyclone signature associated with a tornadic supercell? Select one: a. sounding b. radar radial velocity c. radar reflectivity d. visible satellite e. infrared satellite Tornadoes may form in supercell thunderstorms, squall line thunderstorms and hurricanes. Select one: True False If the Doppler radar detects a mesocyclone signature, approximately how long does it take forecasters to identify its position, track its movement and forecast its future location? Select one: a. seconds b. at least 10 minutes c. about a half hour d. This is not possible yet. The national network of wind profilers is concentrated in the central United States. Select one: True False The National Lightning Detection Network has only been implemented in parts of the eastern United States. Select one: True False Visible satellite imagery is most helpful during nighttime hours. Select one: True False Where is the Lightning Detection Network currently installed? Select one: a. in the Central Plains b. across the entire United States c. in the mountainous regions of the West A or An ________ image from the GOES satellite allows us to measure the amount of moisture in the atmosphere. Select one: a. visible b. infrared c. water vapor Station models are used to represent data on both surface maps and upper air maps. Select one: True False The approximate direction and speed of the wind at the 500 mb level can be determined from what type of map? Select one: a. A contour map showing the altitude (height) of the 500 mb surface. b. A map showing isotherms (lines of constant temperature) on the 500 mb surface. c. A map showing isodrosotherms (lines of constant dew point temperature) on the 500 mb surface. d. a, b and c are all wrong. The only way to tell the direction and speed of the wind on the 500 mb surface is to have winds plotted directly on the chart. Medium-range forecasts provide predictions of the state of the atmosphere from 0 to 16 days into the future. Select one: True False A conditionally unstable atmosphere is______ for an air parcel that is unsaturated and ______ for an air parcel that is saturated. Select one: a. unstable; stable b. unstable; unstable c. stable; unstable d. stable; stable e. neutral; unstable Which of the following lapse rates is measured by a rawinsonde? Select one: a. Moist Adiabatic Lapse Rate b. Environmental Lapse Rate c. Dry Adiabatic Lapse Rate d. Aerological Lapse Rate e. Mental Lapse Rate What type(s) of thunderstorms appear as a long continuous line on radar reflectivity, extending hundreds of miles. Select one: a. frontal squall line thunderstorms b. airmass thunderstorms c. supercell thunderstorms d. mesoscale convective system thunderstorms e. all thunderstorm types F0 tornadoes are the least common tornadoes. Select one: True False Melissa Hinton ATMS 1002—Synthesis Activity 6 Ch. 4 (pg 72) –Forecasting and Simulating Severe Weather-Inadequate Forecasting When a forecast reaches 15 days it becomes known as a: a. b. c. d. e. Bi-weekly Forecast Monthly Forecast Spaghetti Forecast Macaroni Forecast None of the above Ch. 6 (pg 117) –Atmospheric Stability-Stability Indicies The popular ______________ is often used in the assessment of non-severe convective precipitation. a. b. c. d. SWEAT Index TT Index SWAT Index K Index Ch. 18 (pg 309) –Thunderstorms-Ordinary Thunderstorms Round sagging, pouch like bags hanging down from the anvil that form as particles evaporate in the anvil are called: a. b. c. d. Nimbostratus clouds Cumulus Clouds Cumulonimbus clouds None of the above (mammantus clouds) Ch. 22 (pg 406) –Downbursts-Downburst Structure Strong winds generally occur within ________________ of the surface, at the base of the curl in the flow. a. b. c. d. e. 30 to 50 meters 10 to 25 meters 70 to 80 meters 100 to 120 meters None of the above Ch. 19 (pg 337) –Tornadoes-Tornado Formation in Supercells Which level of a mesocyclone are/is associated with the development of a wall cloud during the process of supercell tornadogenesis? a. b. c. d. e. Mid-level High-level Low-Level Both a & b None of the above Ch. 2 (pg 18) Meteorological Measurements Universal Time is set in London, England. This time zone is called: a. b. c. d. UTC Time Z GMT CST The three primary channels used by satellites for imaging weather systems are AM (amplitude modulated), FM (frequency modulated), and Microwave (tuned to water vapor frequency). Select one: True False Doppler radar is a valuable tool for detecting severe thunderstorms but we have not yet figured out how to use it to detect winter precipitation such as snow. Select one: True False Automated Surface Observing Systems (ASOS) and Automated Weather Observing Systems (AWOS) work nonstop, 24-hours a day, to collect atmospheric data. Select one: True False Which of the following is most representative of what is displayed on an infrared GOES satellite image? Select one: a. density b. cloud top pressure c. cloud top temperature d. cloud top relative humidity e. all of the above The frequency shift related to the movement of the raindrops and ice particles along the direction of a Doppler radar beam is similar to the frequency shift in sound waves from a train’s whistle as the train approaches and then passes your location. Select one: True False At what altitude above sea level is the 500 mb pressure surface typically located? Select one: a. 1,000 ft b. 5,000 ft c. 10,000 ft d. 18,000 ft e. 30,000 ft On a surface station model, if there is no significant weather occurring an "N" is placed between the temperature and dew point temperature values. Select one: True False Which of the following is not considered to be a factor that contributes to the degradation of forecasts made via numerical weather prediction? Select one: a. inexact equations b. errors in initial data c. inadequate resolution d. climate changes due to global warming Which statement about numerical weather prediction is false? Select one: a. To do the model calculations, weather data are organized on grids. b. Model forecasts are initialized every hour, corresponding to the times that data is available from rawinsondes. c. The model must be given information about things like snow cover and the underlying topography. d. Computer models must make forecasts quickly so that the model output is available in time to disseminate forecasts. What will happen if a parcel of air is displaced vertically in an unstable environment? Select one: a. It will remain in its new position. b. It will return to its original position. c. It will continue to accelerate away from its original position. d. None of the above. Air cannot be displaced vertically in the atmosphere. In the atmosphere, a rising air parcel will expand. Select one: True False If an air parcel is displaced vertically in a stable environment, what will the parcel do? Select one: a. remain in its new position b. return to its original position c. turn east due to the pressure change d. turn north due to the pressure change e. accelerate away from its original position What term describes the accumulation of rain-cooled air near the surface, under a thunderstorm? Select one: a. cold pool b. gust front c. shelf cloud d. overshooting top e. mammatus cloud Frontal squall lines can be hundreds of miles long. Select one: True False What is the term used to describe the bulge at the top of a thunderstorm caused by a strong updraft? Select one: a. cold pool b. gust front c. shelf cloud d. overshooting top e. mammatus cloud What type(s) of thunderstorms contain thunder and lightning? Select one: a. supercell thunderstorms b. frontal squall line thunderstorms c. airmass thunderstorms d. mesoscale convective system thunderstorms e. all thunderstorm types These vortices are most commonly observed off coastlines in tropical regions. Select one: a. gustnado b. dust devil c. landspout d. waterspout e. cold air funnel If you wanted to determine the extent of cloud cover over the United States at noon, Central Daylight Time in mid-summer, which weather product would you examine? Select one: a. sounding b. wind profiler data c. visible satellite image d. radar reflectivity image Which of the following statements about satellites is(are) true? Select one: a. Infrared satellite images show the temperature of the cloud tops. b. A satellite in geostationary orbit views the same region of Earth 24 hours a day. c. The vapor channel can identify regions of the atmosphere that are dry or moist because it is sensitive to the water vapor concentration. d. The visible channel observes frequencies of electromagnetic energy that our eyes can sense. e. All of the above are true. Vertical wind shear is generally necessary for a thunderstorm to become severe. Select one: True False Tornadoes have occurred in all 50 states. Select one: a. Fact b. Myth Tornadoes cannot hit downtown areas because the buildings deflect the airflow. Select one: a. Myth b. Fact If you are driving in a car on the highway and see a tornado behind you, find the nearest overpass and hide under it. Select one: a. Myth b. Fact When the tornado siren goes off, go to the innermost room on the lowest level of your house or building. Select one: a. Fact b. Myth Tornadoes are attracted to mobile home communities. Select one: a. Fact b. Myth Tornadoes sometimes sound like a freight train. Select one: a. Fact b. Myth Tornadoes can be invisible. Select one: a. Myth b. Fact Wind speeds within a tornado can exceed 200 miles per hour. Select one: a. Myth b. Fact Tornadoes always rotate counter-clockwise in the Northern Hemisphere. Select one: a. Fact b. Myth If a tornado watch has been issued, this means a tornado has been sighted. Select one: a. Myth b. Fact If there is a tornado warning, you should open all the windows in your house or apartment. Select one: a. Myth b. Fact Tornadoes can be made up of 2 or more smaller tornadoes called suction vortices. Select one: a. Myth b. Fact The radial velocity image shown below on the left and radar reflectivity image shown below on the right is from May 24, 2011 when several tornadoes occurred in Oklahoma, including a few EF4s and EF5s. The storm circled in blue was producing an EF4 tornado at this time between Chickasha and Oklahoma City . Notice how the greens and blues toward the radar and the reds and pink away from the radar form a nice counter-clockwise couplet in this region. This is what you want to look for when determining whether a mesocyclone or some other circulation that may be associated with a potential tornado (or one that is about to occur) is present and should be warned on. Answer the following two questions about the image above: What type of storm produced the tornado in Chickasha? Select one: a. mesoscale convective system b. supercell c. derecho d. multicell The top images above are zoomed in on the Broken Arrow tornado, while the bottom images above are zoomed in on an EF1 tornado that occurred near Spavinaw, OK about an hour later from the same storm. What kind of thunderstorm feature was associated with these tornadoes? Select one: a. hook echo of a supercell thunderstorm b. hook echo of a multicell thunderstorm c. bookend vortex of a small bow echo feature of a squall line At least three tornadoes were confirmed in south Louisiana on April 24, 2013, including two associated with one of the storms circled above around Noon. Using the image above, which storm do you think was producing tornadoes around this time? Select one: a. Storm 3 b. Storm 2 c. Storm 1 The image below is from April 2, 2012 when several tornadoes occurred in and around the Dallas-Fort Worth metroplex. Using the images below, determine whether you think a tornado warning should be issued for each storm discussed below. Would you issue a tornado warning on storm 1? Select one: a. Yes b. No Radar reflectivity is sensitive to which of the following? Select one: a. the size of the reflecting particles b. the composition of the particles, i.e., liquid vs. ice c. the upward velocities in a thunderstorm’s core d. All of the above are correct. e. a and b are correct, c is incorrect In which of the following states is large hail most frequent? Select one: a. Florida b. Alaska c. Illinois d. Alabama e. Oklahoma At what location in the updraft of a thunderstorm do rising cloud droplets supercool? Select one: a. below the 0C level b. above the 0C level c. at the base of the cloud d. at the tropopause e. none of the above Hailstones that form via the wet growth regime typically have what characteristic? Select one: a. They are opaque or milky white. b. They are at least one inch in diameter. c. They have tiny air bubbles trapped inside the hailstone. d. The surface temperature of the hailstone is at 0C. What is the typical diameter of a lightning bolt? Select one: a. less than 1 mm (0.04 inches) b. 1 to 2 cm (0.4 to 0.8 in) c. 2 to 3 cm (0.7 to 1.2 in) d. 5 to 10 cm (2 to 4 in) e. More than 15 cm (6 in) Which statement best explains how thunder forms? Select one: a. Two thunderstorms with opposite electrical charge collide. b. The air within a lightning channel heats and cools rapidly, expanding and contracting. c. Turbulent wind motions within the thunderstorm create a loud “boom” sound. d. Positively and negatively charged cloud particles collide and neutralize each other, resulting in a loud explosion. Earth’s fair weather electric field has a net __________ charge in the atmosphere and a net __________ charge on the ground. Select one: a. positive; positive b. positive; negative c. negative; negative d. negative; positive What is the typical length of a lightning bolt? Select one: a. less than 1 km (< 0.6 mi) b. 1 km (0.6 mi) c. 5 km (3 mi) d. 10 km (6 mi) e. more than 10 km (> 6 mi) What is “voltage” related to? Select one: a. the strength of an electrical current b. the speed of an electrical current c. the strength of an attractive force of electrical origin d. the insulating capacity of a substance A tropical weather system is given a number when it reaches which status? Select one: a. tropical disturbance b. tropical depression c. tropical storm d. hurricane A tropical weather system is given a name when it reaches which status? Select one: a. tropical disturbance b. tropical depression c. tropical storm d. hurricane Air descends __________ in the eye of a hurricane and rises __________ in the eyewall. Select one: a. slowly; slowly b. slowly; more rapidly c. rapidly; more rapidly d. rapidly; slowly Hurricanes that develop in the Northern Hemisphere often migrate into the Southern Hemisphere. Select one: True False By what atmospheric variable do meteorologists classify the strength of storms in the tropics? Select one: a. maximum wind gust b. highest air temperature c. lowest sea level pressure d. highest sea surface temperature e. maximum sustained wind speed What does the layered structure of many hailstones result from? Select one: a. recycling, i.e., a looping trajectory b. varying concentrations of pollutants in the air c. varying rates of accretion of supercooled water d. lightning strikes that occurred in the portion of the cloud where the hailstones were growing Hail develops in thunderstorms with updrafts that have ______. Select one: a. very large diameters b. very warm temperatures c. very strong (fast) upward vertical motions d. slanted profiles Which of the following characteristics of a radar beam can be used to distinguish regions of hail and regions of heavy rain? Select one: a. frequency b. polarization c. duration of the transmitted pulses d. time between the transmitted pulses Which statement regarding hail is incorrect? Select one: a. Large hail is associated with strong thunderstorms. b. Hail reaches the ground in only a small fraction of thunderstorms. c. Hail causes problems on Earth’s surface but never poses a hazard to aircraft. d. Hailstorms can fall in great numbers from a thunderstorm, effectively covering the entire ground. Which statement regarding graupel is not correct? Select one: a. Graupel are soft ice particles. b. The consistency of graupel is similar to that of hail. c. The largest concentration of graupel in a supercell thunderstorm is found immediately surrounding the BWER. d. The embryo curtain is often comprised of graupel. Immediately prior to a normal polarity cloud-to-ground lightning strike, what are the respective net charges of the upper cloud, lower cloud and the ground? Select one: a. negative, positive, negative b. positive, negative, positive c. negative, negative, positive d. positive, positive, negative What is the estimated annual loss in the United States due to lightning? Select one: a. $1 million b. $4 to 5 million c. $1 billion d. $4 to 5 billion e. $10 billion Which of the following is (are) a good conductor(s)? Select one: a. air b. metal c. water d. plastic e. b and c are both correct. Approximately what percentage of lightning victims are male? Select one: a. 35 percent b. 50 percent c. 65 percent d. 85 percent At what altitude are the strongest winds of a hurricane found? Select one: a. at the sea surface b. 0.5 to 1 km (0.3 to 0.6 mi) above the surface c. 5 km (3 mi) d. near the tropopause What process generates the warm core in the eye of a hurricane? Select one: a. friction b. solar heating c. wind shear d. warm, ocean water e. adiabatic descent, compressional heating What part of the hurricane emanates out from the center of the cyclone and is associated with a “curled” shape, as viewed from above? Select one: a. eye b. funnel c. eyewall d. spiral rainband The strongest hurricanes are ranked “EF5” on the Enhanced Fujita scale. Select one: True False Information about the rotational wind speeds and forward movement of four hurricanes is provided in the sketches below. Four quadrants in each storm are defined relative to the direction the storm is moving. Use the information to evaluate the winds in the eyewall in the four quadrants of the storm (right, left, front and back). In addition, use the information provided to determine the Saffir-Simpson rating of each hurricane. Wind in S quadrant of Hurricane Abby 70 Wind in N quadrant of Hurricane Abby 70 Wind in W quadrant of Hurricane Abby 75 Wind in E quadrant of Hurricane Carolyn 75 Saffir Simpson rating for Hurricane Abby cat1 Answer 1 Choose... Answer 2 Choose... Answer 3 Choose... Answer 4 Choose... Answer 5 Choose... Wind in N quadrant of Hurricane Carolyn 95 Wind in NE quadrant of Hurricane Benny 130 Wind in W quadrant of Hurricane Don 130 Saffir Simpson rating for Hurricane Benny cat 3 Saffir Simpson rating for Hurricane Don cat 3 Wind in N quadrant of Hurricane Don 130 Wind in SW quadrant of Hurricane Benny 160 Answer 6 Choose... Answer 7 Choose... Answer 8 Choose... Answer 9 Choose... Answer 10 Choose... Answer 11 Choose... Answer 12 Choose... Match the statements to the types of lightning phenomena listed below. Some answers can be used more than once. HL − heat lightning BE − bead lightning SL − sheet lightning SE − St. Elmo’s Fire RS − red sprites BJ − blue jets EL − elves BA − ball lightning PP − positive polarity lightning ST − stepped leader Lightning from the anvil region of a thunderstorm. PP Answer 1 Choose... Disk-shaped regions of light found far above a thunderstorm. EL Answer 2 Earliest part of a lightning discharge in which negative charge begins to descend below cloud base. ST Answer 3 Choose... Choose... Floats in air after a lightning strike; ranges in color and may last 30 seconds. BA Answer 4 Lightning stroke breaks into separate, distinct segments of light that do not last long enough to be observed by the human eye. BE Answer 5 Cannot be detected by the naked eye, but extend in a cone shape from the top of the active part of thunderstorms. BJ Answer 6 Illuminates a cloud uniformly. Answer 7 SL Choose... Choose... Choose... Choose... Large, weak luminous flashes that emanate upward from the anvil regions of thunderstorms and are brightest at heights of 65 to 75 km. RS Answer 8 Flash of light overhead from a lighting stroke so far in the distance that thunder is not heard. HL Answer 9 Sparks that occur on metal objects. Answer 10 SE Choose... Choose... Choose... Melissa J. Hinton ATMS 1002 Synthesis Activity 3 Chapter 1--Temperature 1. Temperatures _______________ with height up to 12 km, they _______________ once they reach over 12 km up to 50 km. Once they reach over 50 km they _______________ again. Temperatures increase near the borders of outer space. A. decrease; increase; increase B. increase; decrease; increase C. decrease; increase; decrease (pg. 4) D. increase; increase; increase E. They all vary each day depending on the weather patterns. Chapter 8—Curved Flow 1. In curved flows around the high-pressure, the true flow will be _______________ than its geostrophic value. A. slower B. the same (pg. 141) C. faster D. none of the above Chapter 12—Vertical Structure of the Atmosphere during Freezing Precipitation 1. _______________ create(s) freezing precipitation when the snow falls from high in the clouds into an atmospheric level where the temperatures exceed 0°C. A. supercooled warm rain process B. melting levels C. freezing drizzle D. freezing rain E. none of the above (pg. 209—melting process) Chapter 11—Gulf Coast Cyclones 1. Which climatic change is taking place when subtropical jetstreams are stronger due to the surface sea temperatures and moisture in the tropical atmosphere? B. Tornado C. Hurricane D. E. Cyclone Chapter 15—Extreme Event—The Winter of Blizzards 1. Which state(s) have had the worst blizzard(s) on record? A. South Dakota B. New York C. Minnesota D. North Dakota E. Both B & C F. Both A & D (pg. 263)
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