I feel sultry before a thunderstorm in summer and cool after the rain. Why?

Summer rainfall is generally caused by the combined influence of cold air and warm and humid airflow, while sultry is the expression of the increase of water vapor and temperature in the atmosphere. This is also a precursor to summer thunderstorms. ?

The rain in summer is mostly showers and thunderstorms, which is due to the fine weather, high temperature and strong air convection in some areas, which makes a large number of hot and humid air rise sharply and form cumulonimbus clouds.

At the same time, the hot air in the atmosphere is increasing and the water vapor is sufficient. Although the temperature has not changed much at this time, the water on the ground is not easy to evaporate, and the sweat on people is not easy to volatilize, so it will feel very stuffy and uncomfortable.

Distribution characteristics

Judging from the time of day, thunderstorms mostly occur in the afternoon and evening.

There are more opportunities on land when the thermal convection is strong in summer afternoon, forming a "thermal thunderstorm". At sea, thunderstorms often occur at night because of the slow cooling of the sea surface and unstable air at night. Thunderstorms near the front can occur simultaneously. In mountainous areas, topographic precipitation can occur. Thunderstorms are usually paroxysmal, and there are often strong winds.

Sometimes accompanied by tornadoes and hail. Persistent and intense thunderstorms can often reach the level of heavy rain. The most active areas of thunderstorms in the world are the tropics and mountains. There are 75- 100 thunderstorm days in the tropics, 20-50 thunderstorm days in the middle latitudes, only a few thunderstorm days in the polar regions, and there are no thunderstorms all the year round north of 82 degrees north latitude.

Bogor, Indonesia has the most thunderstorms in the world, with an average of 322 thunderstorm days every year, so it is called "Thunderstorm Capital of the World". The area with the most thunderstorms in China is Nanling Mountains, with an average of 50 thunderstorm days per year. Hainan Island, a big city, has an average of 130 thunderstorm days, so it is called the "Thunder Capital" of China.