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12 Cards in this Set

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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


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


Precipitation

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