Typhoons are a common weather phenomenon that occurs mostly in the summer and autumn.

Conditions for the formation of typhoons:

1. There must be a vast atmosphere of high temperature and high humidity.

The temperature and humidity of the underlying atmosphere on the tropical ocean surface are mainly determined by the sea surface water temperature.

Typhoons can only be formed on warm ocean surfaces where the sea temperature is higher than 26°C-27°C.

2. There must be a primordial vortex.

This will prevent the typhoon from disappearing in the early stages of formation as the surrounding airflow flows directly into the centre of the low vortex, causing it to fill up quickly.

Also, the difference in wind speed between high and low altitude in the typhoon generation area should be small, which is the main reason why typhoons are not easily generated above 20 degrees latitude.

3. The difference in wind speed in the vertical direction should not be too great, and the relative movement of the upper and lower air layers should be small in order to allow the latent heat energy released by water vapour condensation in the initial disturbance to be concentrated and preserved in the air column in the typhoon eye area, forming and strengthening the typhoon warm centre structure.

4. The Earth's rotation should be sufficiently large for the typhoon structure to be conducive to the generation of cyclonic vortices.

The earth's deflection is close to zero near the equator and increases towards the north and south poles.

Typhoons basically occur in the oceans about 5 latitudes above the equator.

Causes of typhoon formation.

Typhoons originate in tropical seas, where high temperatures evaporate large amounts of seawater into the air, creating a low pressure centre.

As the pressure changes and the Earth moves itself, the incoming air spins up, forming a counter-clockwise whirlpool of air, which is known as a tropical cyclone.

As long as the temperature does not drop, this tropical cyclone becomes stronger and stronger, eventually forming a typhoon.

Typhoons are classified into six classes: super typhoon, strong typhoon, typhoon, strong tropical storm, tropical storm and tropical depression.

The arrival of a typhoon can cause a lot of damage to people.

1. Typhoons can inundate people.

In areas swept by typhoons, houses can be damaged and people who are unable to escape can be injured, drowned or electrocuted.

2. Typhoons can destroy buildings.

Typhoons not only destroy fragile buildings, but also damage crops, drown cattle, lose homes, fields and animals.

3. Typhoons can affect flights.

During a typhoon, some flights may be forced to stop and some flights already on their way may be hit, which is quite scary to think about.