How are typhoons formed? Why do typhoons gradually weaken after landing?

Typhoon is also a type of tropical cyclone. my country's meteorological department stipulates that tropical cyclones with maximum wind speeds of 12 or above near the ground center are collectively called typhoons. In a broad sense, tropical cyclones with sustained wind speeds of 17.2 meters per second or above in the center, including tropical storms, severe tropical storms and typhoons, are all called typhoons. Nowadays, people don't know much about the formation of typhoons. The following is a detailed introduction!

Contents of this article

1. How are typhoons formed?

2. Reasons why the typhoon gradually weakens after landing

3. Differences between tropical depression and typhoon

How are typhoons formed?

Nowadays, people do not have a full understanding of the formation of typhoons, but the necessary conditions for the formation of typhoons include: a pre-existing disturbance, the sea surface temperature is higher than 26.5℃, the generation location is generally 5 latitudes away from the equator, and the vertical shear of the entire tropospheric wind is small.

Today, people do not have a full understanding of the formation of typhoons. The above four conditions are the necessary conditions recognized by the academic community as of 2020.

According to the intensity of typhoons, they are divided into six levels: tropical depression, tropical storm, severe tropical storm, typhoon, strong typhoon and super typhoon.

The maximum wind speed of a tropical depression is level 6-7, and trees will shake. The maximum wind speed of a super typhoon is ≥ level 16, and it will destroy everything in its path, causing serious disasters.

The reason why the typhoon gradually weakens after landing

First, after the typhoon made landfall, there were too many obstacles on land, with ups and downs, and friction and energy consumption, causing the typhoon's strength to weaken rapidly.

Second, a typhoon is a low-pressure cyclone formed in tropical or temperate zones. It is constantly replenished with water vapor at sea, which enhances its strength. After making landfall, the water vapor decreases rapidly and cannot be replenished, causing the typhoon to weaken.

Typhoons are tropical cyclones. Tropical cyclones are generally low-pressure vortices that occur over tropical or subtropical oceans and are strong and deep tropical weather systems.

Tropical cyclones are classified according to the maximum average wind speed near their bottom center. Those reaching level 12 or above are called typhoons.

Typhoons are also divided into six levels according to their intensity: tropical depression typhoon, tropical storm, severe tropical storm, typhoon, severe typhoon and super typhoon.

Differences between tropical depression and typhoon

Tropical depression is a type of tropical cyclone, belonging to the weakest level of tropical cyclone intensity. According to international regulations, a tropical depression is defined as a maximum wind speed of 10.8-17.1m/s (force 6-7). Typhoon is also a type of tropical cyclone. my country's meteorological department stipulates that a tropical cyclone with a maximum wind speed of 12 or above near the ground center is collectively referred to as a typhoon.

A tropical depression is composed of many upward-developing, strong convective clouds, and is a so-called "tropical disturbance" formed by clouds that develop in unstable air zones over tropical oceans. It has the characteristics of a warm core, a circulation center, convective clouds, vortex wind and rain areas, and has its own movement path.

In a broad sense, tropical cyclones with sustained central wind speeds of 17.2 meters per second or above, including tropical storms, severe tropical storms and typhoons, are all called typhoons.