[Explanation] After the 2021 Typhoon No. 6 "Fireworks" landed in China on July 25, it landed in Zhejiang twice on July 25-26. After entering Jiangsu at 16:00 on the 26th, it stayed for more than 24 hours and ended on July 25. Moved into Anhui in the early morning of the 28th.

Gao Shuanzhu, chief forecaster of the Central Meteorological Observatory, said that the typhoon "Fireworks" will continue to affect most parts of East China in the next two days.

　　[Concurrent] Gao Shuanzhu, Chief Forecaster of the Central Meteorological Observatory

　　It is expected that this "firework" will continue to be maintained in the form of tropical depression in East my country for about two days. At this time, it may affect most parts of East China and there will be some precipitation.

The intensity of a tropical cyclone is mainly determined by the magnitude of its wind. The current "firework" wind is not as strong as it used to be, and it is in a tropical depression that has weakened into a tropical depression, but its rainfall situation is different. Did not weaken.

　　[Explanation] Why does the typhoon "fireworks" "turn around" in our country for a long time?

According to Gao Shuanzhu, the main reason is that the "firework" has a complicated moving path and slow moving speed, and it may be affected by Typhoons No. 7 and No. 8 during its life history.

　　[Concurrent] Gao Shuanzhu, Chief Forecaster of the Central Meteorological Observatory

　　It is true that "firework" has some special characteristics. We concluded that its speciality is mainly manifested in the complexity of its path. Indeed, in the initial stage of its generation, it is basically a path that is mainly westward and then swings north-south.

And most of the time the moving speed of its typhoon, the moving speed of the center is only about 5-10 kilometers, so it is 15-20 kilometers or 20 more than we think the normal or average speed of the typhoon. For such speeds as kilometers per hour, it is a lot slower.

The moving aspect mainly considers its background conditions. Some surrounding weather systems have some influence on it. In the course of its life history, there are also Typhoon No. 7 and Typhoon No. 8, which all influence each other and restrain each other. .

　　[Explanation] From the 22nd to the 28th, the "fireworks" has brought heavy wind and rain to Zhejiang, Shanghai, Jiangsu and other places. The total daily rainfall of 12 national stations in Zhejiang and Shanghai exceeded the historical extreme value of July. Why "fireworks" "So enough rain?

Gao Shuanzhu pointed out that the slow moving speed is the reason.

　　[Concurrent] Gao Shuanzhu, Chief Forecaster of the Central Meteorological Observatory

　　After it landed in coastal areas, it did not go deep (to) very inland areas, and its water vapor supply is very sufficient.

Another important reason for slow movement is that it is the same place. If its rainfall intensity and rainfall per hour are a value, then if it moves slowly, the place will rain for a long time. .

For example, this typhoon may have been in the northeast of Zhejiang from around the 22nd. Because the rainfall has continued to the present, sometimes the typhoon has continued to be large and sometimes small (always). It is said that it lasted for a very long time, so its cumulative The precipitation is relatively large in some places.

　　Dong Zeyu reports from Beijing

Editor in charge: [Zhang Kaixin]