The formation of wind is the result of air flow. The formation of wind is that the hot air on the ground flows upward, and the cold air above decreases downward, thus causing air mobility.

Every part of the earth is digesting and absorbing the heat from the sun. Because of the asymmetry of heat in every place on the ground, the degree of air is different. Therefore, warm air expands lighter and then rises. Cold air refrigeration becomes heavier and heavier and then decreases, so that cold and hot air will cause liquidity and wind.

Wind is the air of standard fitness exercise, and air causes fitness exercise, mainly because different levels of the earth receive different solar irradiance. In equatorial and low latitudes, the height-width ratio of the sun is large, the sunshine time is long, the solar irradiance is strong, the ground and air receive more heat and the temperature is high; At higher latitudes, the aspect ratio of the sun is small, the sunshine time is short, the heat received by the ground and the air is small and the temperature is low.

This temperature difference between high latitude and low latitude creates a standard pressure gradient direction between north and south, so that the air can do horizontal fitness exercise, and the wind should blow along the derivative of the standard pressure direction, that is, the vertical line and isobar blow from high pressure to low pressure.

The earth rotates at a uniform speed, which makes the horizontal fitness exercise in the air produce a kind of bias force, which is called geostrophic bias force. This force makes the cyclones in the northern hemisphere move to the right, and the cyclones in the southern hemisphere move to the right, so the atmospheric movement of the earth is not only affected by the pressure gradient force, but also by the geostrophic bias force. The real air fitness exercise is the result of the comprehensive harm of these two forces.

For example, a tornado is the most obvious vortex in the air. It is a small wind vortex with huge wind speed that extends to the ground or river with the bottom of cumulonimbus clouds. Summer often occurs in thunderstorm weather, especially from noon to dusk. Although the scope of harm is small, it is very lethal.

Water vapor rises to the sky, cold and suspicious, producing clouds. At high altitude, the temperature of the cloud is relatively low, and the surrounding water vapor is constantly cooling and the volume is also decreasing, which makes the water vapor in the surrounding air constantly fill the remaining indoor space reduced by cold suspicion.

Because the water vapor rising under the cloud rises linearly, the molecular structure of the water vapor is cold in the whole process of rising, and its volume is getting smaller and smaller, and it is gradually stepped by the geostrophic deflection. At this time, the molecular structure of water vapor under the cloud is constantly filling the indoor space, and the error of standard air pressure is getting bigger and bigger, which leads to strong wind, and the uneven steam coming from some surrounding indoor spaces produces sandstorms.