Why is the rainfall in the middle and lower reaches of the Yangtze River so heavy? The Central Meteorological Observatory issued the first red warning for heavy rain this year
Following the issuance of this year's first red warning for heavy rain at 10 a.m. today, the Central Meteorological Observatory continued to issue a red warning for heavy rain at 18:00.
The warning shows that from 20:00 on June 24 to 20:00 on June 25, there will be heavy to torrential rain in Hunan, central and northern Jiangxi, central and northern Zhejiang, southern Anhui, southeastern Guizhou, southeastern Yunnan, northern and western Guangxi, etc., among which there will be heavy rainstorms in parts of southern Anhui, central Hunan, central and northern Jiangxi, central and western Zhejiang, etc., and extremely heavy rainstorms in some parts of northeastern Jiangxi. Some of the above-mentioned areas will be accompanied by short-term heavy rainfall, and local strong convective weather such as thunderstorms and gale will occur.
The forecast released by the China Meteorological Administration also shows that from June 25 to June 27, my country's heavy rainfall belt will be mainly concentrated in the area from northern Jiangnan to the middle and lower reaches of the Yangtze River, and the cumulative rainfall is expected to be higher than the same period in history.
Why is the rainfall in the middle and lower reaches of the Yangtze River in my country significantly higher than in previous years since the plum rain season this year?
Chen Tao, chief forecaster of the Central Meteorological Observatory, said that the heavy rainfall in the northern part of Jiangnan and the middle and lower reaches of the Yangtze River from June 24 to 27 is directly related to the atmospheric circulation configuration. From the perspective of weather situation analysis, in the next three to four days, the subtropical high pressure in the western Pacific will remain stable, and the warm and humid airflow at the edge of the subtropical high will directly penetrate into the middle and lower reaches of the Yangtze River. At the same time, the plum rain front will swing slightly from north to south in the riverside area in northern Jiangnan, and the position change will be small.
"Due to the strong warm and humid air flow and the relatively stable position of the main rain belt, strong convection is more likely to occur on the main rain belt. The above reasons also lead to a higher degree of overlap in rainfall and a longer duration of precipitation, which results in the accumulation of relatively high levels of heavy rainfall from northern Jiangnan to the middle and lower reaches of the Yangtze River." Chen Tao said.
He also said that the heavy rainfall in the south since June 17 has not only lasted for a long time, but has also been characterized by increased precipitation at night, that is, the heaviest precipitation often occurs in the late night to morning period.
According to the forecast of the China Meteorological Administration, most of southern my country, especially the area from northern Jiangnan to the middle and lower reaches of the Yangtze River, will experience continuous heavy rainfall in the next week. How should the public in the corresponding areas prepare for the "violent plum rain"?
Chen Tao said that in the next 24 hours, the public in areas with red warnings for heavy rain should pay attention to forecast and warning information. Urban residents should be alert to the risk of urban waterlogging and pay attention to travel and traffic risks; mountainous areas should pay attention to the risk of geological disasters such as mountain torrents and mudslides caused by heavy rainfall. Local government departments should help the public to do a good job in disaster prevention and mitigation in a timely manner.
