Do not take shelter from the wind and rain in dangerous (old) houses, sheds, temporary buildings, trees, billboards and other places. It's best not to go out when the typhoon comes. Doors and windows in safe areas should be reinforced with adhesive tape, and plywood, plastic plates and blankets should be prepared to reinforce windows. Low-lying and riverside, riverside and other escort areas should be moved to safety as soon as possible.
Except for the low pressure in the center of the typhoon, the pressure of the whole typhoon has been changing rapidly, and most of the changes occur near the eyes, which will lead to great pressure gradient force, which is the reason why the wind force on the eye wall is the largest.
At the eye wall, the wind is much smaller, especially the horizontal wind. When air is sucked into the eye wall near the surface, there will be a weak sinking movement. As the air gradually weakens, it will be slightly compressed and warmed, so the temperature in the center of the typhoon will be higher than that in other places. Because warmer air can retain more moisture before it condenses into clouds, the typhoon eye is cloudless in Wan Li.
Definition of typhoon:
Typhoon is a kind of tropical cyclone. Typhoons often bring strong winds, heavy rains and storm surges. Meteorologically, according to the definition of the World Meteorological Organization, tropical cyclones with sustained wind speed above 12 (i.e. 32.7m to 41.4m per second) are called typhoons or hurricanes. The word "typhoon" has the pronunciation of "gale" in China Cantonese, which was translated into typhoon in China after being spread abroad. It is also said that it evolved from "Fengtai" in Minnan dialect.
Typhoons are usually formed on the sea surface 3-5 latitudes away from the equator in tropical areas, and their movements are mainly influenced by large-scale weather systems, and eventually dissipate at sea, or degenerate into extratropical cyclones, or dissipate after landing. From the classification, typhoons with winds above 12 are divided into three grades, while hurricanes have more grades and higher upper limits.
A first-class hurricane is equivalent to a typhoon or a strong typhoon, a second-class hurricane is equivalent to a strong typhoon, a third-class hurricane is equivalent to a strong typhoon or a super typhoon, and a fourth-class hurricane and a fifth-class hurricane are equivalent to a super strong typhoon. In China, tropical cyclones in the northwest Pacific are classified into six grades according to the maximum average wind force near the bottom center, in which the wind force is 12 or above, which is collectively called "typhoon".
Refer to the above content: Baidu Encyclopedia-Typhoon