What Causes a Thunderstorm?

Answer

Thunderstorms are caused when an air mass becomes so unstable it overturns or convects violently. 'Unstable' implies that the air in the lowest layers is strangely warm and humid or that the upper layers are oddly cool or often times both.
2 Additional Answers
A thunderstorm is caused by moisture, unstable air and lift. This moisture forms clouds and rain, while unstable air that is relatively warm rises rapidly and lifts from fronts, sea breezes or mountains. It is produced by cumulonimbus clouds, usually with gusty winds, heavy rain and sometimes hail.
Thunderstorms are caused when colder air hits warmer air. The moisture in the clouds cools off and drops as rain, or hail. The movement caused by the meeting of the cool and warm air produce winds and possible lightening and thunder.
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