The weather system that forms a typhoon is

The weather system that forms a typhoon is a tropical cyclone.

Typhoon is a cyclone system in the weather system. When a typhoon forms, it is most afraid of cold air flow. Cold air can make the typhoon disappear. Once it has formed or reached the typhoon level, the cold air also has a deterrent effect on it, which can make it disappear. It reduces levels and path changes.

Typhoons are prevalent in South China, Jianghuai and Jiangnan regions in my country, during the rainy season in North China in July and August. At this time, the middle and lower reaches of the Yangtze River are controlled by the subtropical high, and South China is affected by the southeasterly winds from the southern part of the subtropical high.

When a typhoon passes through:

Wind speed: If the weather is fine and the wind speed is low before the typhoon passes through, the intrusion of clouds from the periphery of the typhoon will increase the wind speed. As the typhoon approaches, the wind speed will increase. The larger it is, the closer to the center the greater the wind speed.

Wind direction: Before a typhoon passes through, if there is no strong convective weather, the wind is usually blowing from the south. After the typhoon invades, the wind direction changes to the southeast or easterly wind, bringing a lot of water vapor and increasing cloud cover. The cloud base gradually lowered.

Air pressure: If the weather is fine and the air pressure is high before passing through, especially in areas controlled by the subtropical high, the air pressure will begin to decrease when the typhoon passes through. Since the typhoon is a cyclonic weather system, the closer to the center the higher the air pressure. If a certain place is lucky enough to enter the eye of a typhoon, the air pressure will increase.

Precipitation: The precipitation in the cloud system near the typhoon is long-term convective precipitation. When the typhoon passes, there will be continuous heavy rain in the local area. The amount of rainfall is related to the intensity of the typhoon and the distance from the center. The rainfall can often last until the typhoon. Move out or dissipate.