Typhoons bring all kinds of heavy rainfall, but why are they so dry and hot before they hit?

The extremely hot and dry weather before the arrival of the typhoon may be due to many reasons. The possible reasons are:

1. This is mainly related to the cause of the formation of the typhoon. The sun Continuous high temperature irradiation causes the water on the ocean surface to evaporate. The constantly evaporating water will gradually repel other gas components in the air, causing the air humidity to increase sharply. This high-humidity air is the basis for the formation of typhoons. Once this foundation is established, when there are external conditions that promote the condensation of moisture in high-humidity air, the pressure of the air will drop sharply, resulting in a negative atmospheric pressure relative to other surrounding air. This negative pressure is the formation of a typhoon. center negative pressure.

2. Typhoon is a low-pressure system. According to the typhoon structure diagram, it can be seen that the airflow in the low-pressure center of the typhoon rises. The rising airflow will flow around at high altitude and sink at the outer edge of the typhoon. , so the area on the outer edge of the typhoon will have sultry air due to the sinking airflow. The peripheral airflow is downdraft, which is very hot and stuffy, so when a typhoon is about to come, the air feels extremely dry and stuffy.

3. In addition, there are also the effects of latitude and topography. Typhoons generally occur in the lighting areas of Taiwan, Fujian, Guangdong, Hainan, Zhejiang, and Guangxi in my country. These areas are in the subtropical region and have relatively low latitudes. The latitude seas provide abundant heat and water vapor for typhoons. In addition, the Pacific Ocean is in the tropical area. The most extensive, with lots of heat and water vapor.

4. According to the information obtained, it can be seen that the formation of wind is related to the air pressure difference. Wind blows from relatively low temperature and high pressure to high temperature and low pressure. Of course, typhoons also blow from relatively low temperature to low pressure. The high pressure area blows towards the high temperature and low pressure area, so it is dry and muggy before the typhoon approaches.