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Thunder generates lightning.

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The gust front occurs:


A) on the lee shore of the Great Lakes.
B) at the leading edge of a thunderstorm downdraft.
C) during the development of thunderstorm clouds.
D) near the anvil part of a thunderstorm cloud.

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Temperature inversions (stable layers) in air layers above the ground can enhance thunderstorm development.

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Why do most tornadoes in the central U.S. occur during the spring months?


A) Divergence of air aloft is greatest.
B) Surface air is most humid.
C) Upper- air temperatures are warmest.
D) Solar energy is a maximum.
E) Air- mass contrasts are greatest.

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In which of the following places are thunderstorms most common?


A) northern Wisconsin
B) central Nevada
C) central Florida
D) west of Hudson Bay (Canada)
E) The occurrence of thunderstorms at all of these places should be about the same.

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Tornadoes and midlatitude cyclones are similar in that:


A) both form in the trade- wind belt.
B) both have conspicuous surface fronts.
C) both are most common and well- developed in the winter season.
D) both circulate around low pressure.

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Why is so- called "heat lightning" not associated with thunder?

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The distance is so f...

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Doppler radars:


A) have much greater range than conventional radars.
B) show the motion of precipitation particles.
C) detect lightning strokes.
D) detect condensation nuclei.
E) show the motion of air in clear areas.

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About how many thunderstorms take place on Earth every day?


A) 1300
B) 45,000
C) 300
D) 5000

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A mesocyclone often precedes tornado development.

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Thunderstorms occur year- round in the:


A) tropics.
B) middle latitudes.
C) subarctic regions.
D) subtropics.
E) polar regions.

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An overshooting top means that:


A) lightning strikes will be especially intense.
B) the thunderstorm has very strong updrafts causing the cloud to grow into the stratosphere.
C) the thunderstorm is dissipating.
D) a thunderstorm will DEFINITELY produce a tornado.

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Multiple- vortex tornadoes help explain:


A) why tornadoes are so short lived.
B) why some tornadoes never touch the ground.
C) what EF rank a tornado should have.
D) why one building is destroyed and the one next to it is untouched.

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"Heat lightning":


A) is actually a display of the northern lights.
B) is brighter than ordinary lightning.
C) is also called "ball lightning."
D) is regular lightning occurring more than 20 kilometers from the person observing it.

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What are the three stages in the development of a thunderstorm? Draw a diagram of each, labeling updrafts and downdrafts as appropriate.

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(1) Cumulus Stage. (...

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An air mass thunderstorm rarely lives long enough to create very severe weather because:


A) the atmosphere is generally fairly stable when these storms develop.
B) there is rarely enough moisture available to keep the storm alive for longer than 30 minutes.
C) wind shear causes the storm's updraft to become tilted.
D) the downdrafts quickly become strong enough to stop the updraft and influx of moisture to the storm.

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Radar detects a thunderstorm by measuring the electrical discharges within the cloud.

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Where would you expect to find precipitation occurring in this thunderstorm?


A) Letter A
B) Letter B
C) Letter E
D) Letter D

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Thunderstorms can be associated with these weather activities:


A) cyclones.
B) tornadoes.
C) hurricanes.
D) cyclones, hurricanes, and tornadoes.

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The terms leader, flash, and stroke are used when describing:


A) a tornado.
B) lightning.
C) the passage of a hurricane.
D) squall line formation.
E) the stages of a thunderstorm.

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