When will the typhoon land in Shanghai?

As of August 6, 2023, there was no typhoon landing in Shanghai, but it was easily affected by typhoon precipitation and storm surge. The National Climate Center released a message on July 15, 2023: It is estimated that the number of tropical cyclones (typhoons) landing in China will be 2-3 (2 in the same period of the year), with a relatively high average intensity, and the paths are mainly westbound and northwest, which will affect Shanghai. July 16 to August 15 is one of the important stages of the main flood season in China. Typhoon activities in the South China Sea and the Western Pacific have entered an active period, and coastal areas are vulnerable to typhoon precipitation and storm surges.

After the typhoon landed, the prediction model was still very different. According to the forecast of Shanghai Central Meteorological Observatory, from August 1 day, Shanghai was affected by the typhoon periphery, and the cloud system increased, sometimes there were showers or thunderstorms, and the wind force increased.

Formation principle of typhoon:

1. Warm and hot seawater: A large amount of warm and hot seawater is needed for typhoon formation, and the seawater temperature is usually required to be above 26.5 degrees Celsius. Such warm seawater provides sufficient water vapor and is the energy source for typhoon formation.

2. Airflow Convergence: On the sea surface, due to the influence of the earth's rotation and topography, the airflow will converge, that is, the airflow will converge. This convergence will cause the air to rise and form a low pressure area.

3. Initial disturbance: Over the tropical ocean, there are usually some weather disturbances, such as storms and convective clouds. When airflow convergence and seawater evaporation provide enough energy, these disturbances can gradually develop into typhoons.

4. Cyclone formation: Due to the influence of the Coriolis force of the earth's rotation, the low-pressure area began to rotate. When the converging airflow continues to rise, it will form a cyclone and begin to have a certain scale.

5. Tissue growth: When a typhoon forms, it will be supplemented by tropical ocean energy and continue to develop and grow. When the wind speed exceeds 17.2 meters per second (about 7 winds), it is called a tropical storm. When the wind speed continues to increase and exceeds 32.7 meters per second (about 12 wind), it is called a typhoon.