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Wind is air in motion. Wind forms when the sun heats one part of the atmosphere differently than another part. This causes expansion of warmer air, making less pressure where it is warm than where it is cooler.
How do they form? Thunderstorms are formed by the uplifting of warm and humid air. There are many factors that lead to the uplifting of air, for example, solar heating; in the vicinity of low pressure troughs; when two different air streams meet; or when air is forced uphill.