Traditional Culture Encyclopedia - Weather inquiry - What is the magnitude of typhoon signal No.3?
What is the magnitude of typhoon signal No.3?
Typhoon 1 refers to a tropical cyclone generated or moved within 800 kilometers from our city, which may affect our city within 48 hours.
Typhoon Typhoon No.2 refers to a tropical cyclone generated or moved within 500 kilometers of our city, which may affect our city within 24 hours, and the wind can reach 6-7.
Typhoon No.3, typhoon ball, said: There is a tropical cyclone moving in within 200 kilometers of our city, which will affect our city within 12 hours, and the wind force can reach more than 8.
Typhoon No.4 means: tropical cyclones will seriously affect our city, with an average wind force of more than 8 and a gust of 1 1 or above.
Typhoon No.5 means: tropical cyclone that landed in or near our city, with average wind force 10 and gust 12.
The signal issued by the typhoon means that the tropical cyclone has weakened or turned halfway, which will no longer have a serious impact on our city.
Structure of typhoon
Typhoon is a deep low-pressure system, and its central air pressure is very low. There is an air flow converging towards the center at the lower level, and the air flow at the upper level mainly diverges outward. If the typhoon is cut horizontally, we can see that there are three obviously different areas, from the center to the outside: typhoon eye area, cloud wall area and spiral rain belt area.
Typhoon Eye Area: It's strange that the wind here is very light and the weather is sunny, with an average diameter of 40 kilometers. The sailors who participated in it humorously called Typhoon Eye "Xanadu".
Cloud wall area: the cloud wall area with a width of tens of kilometers and a height of more than ten kilometers around the typhoon eye, also called eye wall. The cloud wall is towering here, the wind is howling, the rain is pouring, the sea is churning, and the weather is the worst.
Spiral rain belt area: Outside the cloud wall, there are spiral rain belts, and several rain (cloud) belts gather spirally around the eye wall. The rain is tens to hundreds of kilometers wide and several Qian Qian meters long. There will be showers and windy weather where the rain belt passes.
Refer to the above content: Baidu Encyclopedia-Typhoon Typhoon
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