cyclone，hurricaneortyphoonIt is a vortex storm formed on the sea surface and constitutes strong wind and heavy rain. They often cause floods and other damage and therefore pose a threat to travelers, especially inSouthern United StatesNear the coastline,Caribbean、Japan、China、Taiwan、Hongkong、South Korea、the PhilippineswithAustraliaNorth.
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Grade
| level | km/h | mph | destroy |
|---|---|---|---|
| Tropical depression | ≤ 62 | ≤ 38 | negligible |
| Tropical storm | 63-118 | 39-73 | The smallest |
| Category 1 hurricane | 119-153 | 74-95 | Some |
| Category 2 hurricane | 154-177 | 96-110 | widely |
| Category 3 hurricane | 178-208 | 111-129 | serious |
| Category 4 hurricane | 209-251 | 130-156 | Devastating |
| Category 5 hurricane | ≥ 252 | ≥ 157 | Catastrophic |
Different regions have different classification systems. Scientists have proposed several alternative methods, but the systems currently in use are similar. The following table shows the Saffir-Simpson hurricane wind rating used by the National Weather Service. The displayed wind speed is a continuous wind speed; in any category, there are gusts.
In the United States, Category 3 and higher are called "major hurricanes", while in the Western Pacific, Category 4 and 5 are called "super typhoons." These powerful storms form in the Atlantic Ocean every other year and more frequently in the Western Pacific, causing major damage and casualties on the ground where they land.
Warning system
power failure
Non-tropical cyclone
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