Does the typhoon rotate clockwise or counterclockwise?

The typhoon in the northern hemisphere rotates counterclockwise and the typhoon in the southern hemisphere rotates clockwise.

If the earth does not rotate, then the wind will only blow from the high pressure area to the low pressure area. Because the earth is rotating, when the warm air rises, it will be affected by the "geostrophic deflection force" (strictly speaking, it is also called "Coriolis force").

For example, when you try to draw a straight line on a rotating disk, you actually get a curve. Because the direction of "geostrophic deflection force" is just the opposite in the northern hemisphere, the wind will move counterclockwise around the low pressure area in the northern hemisphere and clockwise around the low pressure area in the southern hemisphere.

In addition to the influence of geostrophic deflection force on the direction of typhoon rotation, people also found a phenomenon: the wear degree of the right rail of trains in northern hemisphere countries is always worse than that of the left rail. The reason is that when the train is running, it will be affected by the geostrophic force to the right, so the pressure on the right rail is greater than that on the left rail.

In addition, the formation of typhoons requires not only the rotation of the earth, but also a warm water area to provide energy, which is why typhoons form in low latitudes.

Extended data

Since 1990, China has adopted the international tropical cyclone name and classification standard.

According to international practice, the maximum wind force near its center is divided into:

1, tropical depression with maximum wind speed of 6 ~ 7, (10.8 ~ 17. 1 m/s);

2. Tropical storm with maximum wind speed of 8-9 (17.2-24.4m/s);

3. Strong tropical storm with maximum wind speed10 ~11(24.5 ~ 32.6m/s);

4. Typhoon with maximum wind speed12 ~13 (32.7 ~ 41.4m/s);

5. Strong typhoon with maximum wind speed14 ~15 (41.5 ~ 50.9 m/s);

6. Super typhoon with maximum wind speed ≥ 16 (≥5 1.0m/s).

Baidu Encyclopedia-Typhoon