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12 Cards in this Set

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  • Back

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

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

Usual storm

Lasts 30 min

24 km in diameter

Thunderstorm classification

The mechanism that caused the air to rise

Air -mass thunderstorm

Unequal heating of earths surface within one air mass

Mid afternoon

Mountain thunderstorm

Air mass thunderstorm

Orographic lifting

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

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

Thunderstorm stage classification

Cumulus stage

Mature stage

Dissipation stAge

Direction in which the air is moving

Cumulus stage

Air rises vertically upward

Creates updrafts

Transfers moisture to the upper reaches of the cloud

Condenses and releases lheat


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

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