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The main cause of wind is a little surprising. It’s actually temperature. More specifically, it’s differences in temperature between different areas. How would temperature differences make the wind blow? The gases that make up our atmosphere do interesting things as the temperatures change.
It’s also why winds in the upper atmosphere are relatively weak near the equator. Closer to the mid-latitudes, they howl. They’ve curved so much to the right that they often are speeding eastward at an impressive clip.
The quick answer is that wind blows because of differences in atmospheric pressure. When there’s a difference in pressure, air moves from areas of high pressure to areas of low pressure, creating what we feel as wind.
The wind is air pressure balancing itself out, always flowing from high to low pressure. This is why wind has no beginning or end, as our atmosphere is always full of high and low pressure, ebbing and flowing, around our complex atmosphere. Pressure Gradient Force
In a sufficiently unstable local atmosphere, this causes the convection to reach far higher, and to condense large amounts of water vapor, which fall as rain showers.