Is there a typhoon in Hainan recently?

There is a typhoon in Hainan recently.

At 07: 00 on September 2, 2023, Hainan Meteorological Bureau upgraded the typhoon four-level warning to typhoon three-level warning. Affected by Sura, on the afternoon of September 2-5, the winds in Qiongzhou Strait, Beibu Gulf, western and eastern Hainan Island were 6-7, and the gusts were 8- 10. Other forecast seas have winds of 5-6 and gusts of 7-9. In addition, there was strong wind and rain in the northwest half of Hainan Island from 3 to 5 days.

Land: from September 2 to 3, there were showers or thunderstorms in most parts of the island, and the local area was heavy rain; From September 4 to 5, there was moderate to heavy rain in most parts of the island, including heavy rain to heavy rain in the west and north. It is estimated that from 08: 00 on the 3rd to 08: 00 on the 6th, the accumulated rainfall will be 80- 120mm in Changjiang, Baisha, Dongfang and Ledong, 0/50mm in local area, 60-80mm in Haikou, Chengmai, Lingao and Danzhou, and 30-50mm in other cities and counties.

Formation conditions of typhoon:

The formation of a typhoon requires three conditions. First, the water vapor condition, the ocean has a steady stream of water vapor; The second is thermal conditions. When the sun shines strongly in summer, water vapor can rise. In fact, under these two conditions, rainfall can be generated, heat of vaporization air can form a low-pressure center, and external clouds and air can be supplemented to form wind. So, how do the vortex shapes of typhoon eyes and typhoons come into being?

This involves the third condition of typhoon formation-dynamic condition. It is precisely because of the influence of geostrophic deviation that the northern hemisphere forms a vortex that converges counterclockwise to the center, and the southern hemisphere forms a vortex that converges clockwise to the center. Even if the equatorial region has the first two conditions, it is not easy to form a typhoon because of the small geostrophic deflection. Under the comprehensive action of water vapor, heat and power conditions, a typhoon was produced.