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what causes weather? Weather processes such as wind, clouds, and precipitation are all the result of the atmosphere responding to uneven heating of the Earth by the Sun. The uneven heating causes temperature differences, which in turn cause air currents (wind) to develop, which then move heat from where there is more heat (higher temperatures) to where there is less heat (lower temperatures). The atmosphere thus becomes a giant heat engine, continuously driven by the sun.
The most severe weather usually occurs when warm, humid maritime tropical air collides with dry and cold continental polar air. The nature of air masses is determined by three factors: the originating area of the air mass, the age and the modifications that may arise as the air travels away from its starting point across the surface of the earth.