A) 10%
B) 20%
C) 25%
D) 50%
F) All of the above
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A) people living in "tornado alley."
B) people living in Florida.
C) people living in the Congo basin of central Africa.
D) no one.
F) A) and C)
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A) upper-level winds are strong, because it spreads out the downdrafts.
B) upper-level winds are strong, because their momentum is carried to the surface.
C) upper-level winds are weak, because more wind shear is created.
D) upper-level winds are weak, because less wind shear is created.
F) All of the above
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A) is marked by strong updrafts throughout the cloud.
B) is when much of the storm's precipitation occurs.
C) begins when unstable air begins to rise.
D) occurs before the Bergeron process starts.
F) B) and D)
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C
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A) are individual thunderstorms called supercells.
B) do not last more than 12 to 24 hours.
C) typically have low water-vapor content.
D) require wind shear and substantial uplift.
F) A) and B)
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A) never strikes twice at the same place.
B) strikes anywhere conductivity can be established.
C) never strikes water.
D) always strikes cedar trees.
F) B) and C)
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A) sprite.
B) St. Elmo's fire.
C) ball lightning.
D) sheet lightning.
F) All of the above
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A
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A) indicates a tornado may form soon
B) caused by intensification of the mesocyclone
C) usually located on the north/east side of the supercell
D) forms when cool air is drawn into the storm's updraft
F) All of the above
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Mesoscale convective systems: MCSs can bring intense weather conditions to areas covering several counties.They often have life spans of up to 12 hours,but in some cases they can exist for as long as several days.They are fairly common in North America,and in some parts of the central United States and Canada they account for as much as 60 percent of the annual rainfall.Because the surrounding circulation supports an MCS,they lead to much stronger winds and heavier precipitation than is normally found in an air mass thunderstorm.Supercells: Supercells are intensely powerful storms that contain a single updraft zone.Although supercells often appear in isolation,they can also occur as a part of an MCS. Squall line thunderstorms: Squall line thunderstorms consist of a large number of individual violent storm cells arranged in a linear band,typically about 500 km (300 mi)in length.Although squall lines may be as much as 100 km (60 mi)in width,the embedded band of intense showers is much narrower,usually about 5 km (3 mi),and located near the leading edge of the advancing band of cloud cover and precipitation.A wide area of continuous precipitation normally exists in the central and western portions of the squall line,immediately behind the band of heavy showers.
Squall lines usually form in the warm sector of a midlatitude cyclone immediately ahead of the cold front but then advance more rapidly than the front itself.They may eventually reside about 300 to 500 km (180 to 300 mi)ahead of the front.Squall lines are most common over the southern United States during spring and summer.The average squall line has a life span on the order of 10 hours,though some have lasted up to four days. Supercell storms: Supercell storms are remarkably complex,with the updraft and downdraft bending and wrapping around each other due to strong wind shear.
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A) large hailstones.
B) a lack of conservation of angular momentum.
C) high winds.
D) pressure differences between the inside of the structure and the outside air.
F) A) and C)
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A) windblown sand and dust damaging jet engines.
B) sudden changes in lift and tailwinds.
C) Doppler radar.
D) lightning.
F) C) and D)
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A) is likely originating from multiple lightning bolts.
B) is likely originating from different regions of a single lightning stroke.
C) indicates a reduced intensity of the associated lightning strike.
D) indicates a higher-temperature thunderstorm.
F) B) and D)
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A) 2
B) 10
C) 100
D) 1,000
F) A) and C)
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During the mature stage of an air mass t...View Answer
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A) sinking air.
B) still air.
C) rising air.
D) upper level convergence.
F) A) and C)
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A) gust front.
B) hook echo.
C) shelf cloud.
D) roll cloud.
F) All of the above
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A) relatively flat in eastern portion.
B) lack of major east-west mountain range in east.
C) spans wide range of latitudes.
D) bordered by a cold ocean current on west coast.
F) A) and C)
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A) a large voltage difference occurs only when thunderstorms are present.
B) a large voltage difference always exists.
C) a very small voltage difference usually exists.
D) a very small voltage difference occurs only when thunderstorms are present.
F) B) and D)
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The strong winds aloft push the updrafts...View Answer
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