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12 Cards in this Set
- Front
- Back
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Thunderstorm to form |
Abundant source of moisture in atmosphere Release latent heat to keep cloud moving upward Some mechanism must lift the air so that the moisture can condense and release lheat Atmosphere must be unstable |
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If the air keeps rising |
It can reach stable air and stop Or the condensation/realse of heat is not great enough for the air to rise |
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Usual storm |
Lasts 30 min 24 km in diameter |
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Thunderstorm classification |
The mechanism that caused the air to rise |
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Air -mass thunderstorm |
Unequal heating of earths surface within one air mass Mid afternoon |
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Mountain thunderstorm |
Air mass thunderstorm Orographic lifting |
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Sea breeze thunderstorms |
Coastal areas during summer Local air mass thunderstorms caused in part by extteme temp diffs between the air over land and the air over water |
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Frontal thunderstorms |
Produced by advancing cold fronts and rarely warm fronts Cold front: cold air pushes warm air rapdl up the steep coldfront bondary Line of thunderstorms-^ At night Warm front:warm air mass rises over a cold air mass |
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Thunderstorm stage classification |
Cumulus stage Mature stage Dissipation stAge Direction in which the air is moving |
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Cumulus stage |
Air rises vertically upward Creates updrafts Transfers moisture to the upper reaches of the cloud Condenses and releases lheat Precipitation |
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Mature stage |
The precipitation cools the air around it Air sinks rapidly to ground with rain Creates downdrafts Ups and downs form a convection cell which produce winds |
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Dissipation stage |
Downdrafts are the storms undergoing Convection cell exists when warm air is at surface If that stops, the updrafts stop Downdrafts spread out warm air |
