China News Agency, Beijing, August 5th (Reporter Chen Su) During the flood season this year, Liaoning experienced heavy rainfall. The main stream of the Liaohe River has continued to exceed the warning level for 39 days, and floods have occurred in many places.
The China Meteorological Administration held an online press conference on the 5th to introduce the heavy rainfall in Liaoning.
Gong Qiang, deputy director and senior engineer of the Shenyang Regional Climate Center, said that since the flood season (from June 1 to July 31, the same below), the average precipitation in Liaoning Province was 417.8 mm, which was nearly 249.3 mm more than the same period of the previous year (249.3 mm). 70%, the most in the same period in the past 30 years, and the second largest in the same period since 1951.
The average number of precipitation days was 32 days, 10 days more than normal.
A total of 13 rounds of heavy rain occurred, the most during the same period in history.
Gong Qiang said that the precipitation in Liaoning Province was consistently high, and the precipitation in the 14 cities was 40% to twice as high.
The 10 national-level surface meteorological observation stations in Shenyang Station, Xinmin, Kangping, Shenbei New District, Faku, Heishan, Fuxin Station, Zhangwu, Xifeng and Panjin Station recorded the most precipitation in the same period in history.
On the 1st, under the influence of heavy rainfall, the dam of the Raoyang River in Panjin, Liaoning Province burst, and more than 8,000 local people were urgently evacuated.
Gong Qiang said that since the flood season, Fuxin and Shenyang have experienced 2.0 times and 1.2 times more rainfall than normal in the upper reaches of the Raoyang River break, respectively, the most in the same period in history since 1951.
In the Panjin area where the Raoyang River burst, the precipitation since the flood season was 490.9 mm, 1.1 times more than the same period of the previous year.
From July 28th to 30th, Liaoning Province experienced a regional rainstorm with the longest duration and the strongest intensity since the flood season this year, and the comprehensive assessment was a strong level.
Gong Qiang said that the main flood season in Liaoning is usually in the period of "seven down and eight up" (late July and early August), but this year's precipitation is abnormally high.
Talking about the reasons, she said that the precipitation in Liaoning has the characteristics of interdecadal variation. After 2020, the precipitation in Liaoning will enter a stage with more precipitation. In addition, the abnormal sea temperature also has an impact on the precipitation in Liaoning. The SST in the Indian Ocean is warmer, and the SST tripole in the North Atlantic is in positive phase. Through the interaction of air and sea, it affects the circulation in the middle and high latitudes, resulting in a stronger northeast vortex in early summer, which leads to more rainfall in June.
Entering July, the northern boundary of the western Pacific subtropical high is located to the north. In addition, the typhoon in early July brought the extratropical cyclone northward, which also enhanced the transport of water vapor and aggravated the abnormally high precipitation in July.
The forecast shows that in the next 10 days, Liaoning will still have two strong rainfall processes accompanied by strong convective weather.
Experts remind that people in the northern region, especially in Liaoning, need to be alert to the geological and mountain torrent disasters caused by local heavy rainfall, as well as floods in small and medium rivers and urban waterlogging, pay attention to the weather forecast, try to avoid traveling to dangerous areas, and reduce outdoor activities in strong convective weather. .
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