What are the main hazards of typhoons?

Typhoons can cause floods. After typhoon "Fete" landed, waterlogging in Yuyao and other places was serious, and the water in many streets was waist deep, exceeding 1 meter. Some primary and secondary schools were forced to suspend classes.

2. Typhoon will drown people. In areas swept by typhoons, houses may be damaged, and people who have no time to escape may be injured, drowned or electrocuted.

Typhoon will destroy buildings. Typhoon will not only destroy fragile buildings, but also destroy crops, drown some cows, lose their fields and even their animals.

4. Typhoon will affect flight. During the typhoon, some flights may be grounded, and some flights already on the road may be attacked, which is quite scary to think about.

Extended data

The formation of typhoon needs: the sea surface water temperature is above 26.5℃; Initial disturbance of a positive vorticity; The shear of ambient wind in the vertical direction is very small; Low pressure or cloud disturbance is at least several latitudes from the equator.

Because people's understanding of typhoon formation is not sufficient so far, the above list is only a necessary condition for typhoon formation. The initial stage of typhoon is tropical depression, and it usually takes about 2 days from the initial low-pressure circulation to the maximum average wind force near the center, only three or four days for the slow one and only a few hours for the fast one.

In the development stage, the typhoon continuously absorbs energy until the central air pressure reaches the lowest value and the wind speed reaches the maximum value. After the typhoon landed, it was affected by ground friction and insufficient energy supply.

There are two paths for typhoon extinction.

The first one is that after the typhoon lands, it will weaken and die quickly due to the joint influence of ground friction and insufficient energy supply, and the residual cloud system after its death can bring long-term heavy rainfall to a certain place.

The second is that after a typhoon lands, it is easy to degenerate into an extratropical cyclone to the north, and after it degenerates into an extratropical cyclone, it will generally die out.

Baidu Encyclopedia-Typhoon