Experts: We need to be alert to the superimposed effects of precipitation, wind and hail, and the strongest precipitation in the south
On May 4, the May Day holiday is coming to an end, and various places are experiencing a peak in return passenger flow. At the same time, large-scale severe convection and heavy precipitation weather processes have recently occurred in many places in southern my country. What are the characteristics of this weather process? What weather should tourists pay attention to when returning? How to prevent it? Zhang Tao, chief forecaster of the Central Meteorological Observatory, explained this.
According to the Central Meteorological Observatory, precipitation in the south briefly weakened on May 1st and 2nd, but a new round of precipitation began to develop again from the 3rd, mainly concentrated in Guangdong, Jiangxi, Hunan, Hubei, Guizhou and other places. May 4th was the strongest period of this round of heavy rainfall from daytime to nighttime. Some areas in Hunan, Jiangxi, Guangxi, Guangdong and other places experienced heavy to heavy rains and local heavy rains, accompanied by strong convective weather such as thunderstorms, strong winds or hail.
Why has there been frequent rainfall in the south recently? What are the characteristics? Zhang Tao analyzed that this round of precipitation is caused by the eastward movement of the upper-altitude trough and the northward movement of southwesterly warm and humid air, which mainly affects places such as South China and Jiangnan. The precipitation in northern Guangdong and Guangxi and southern Hunan and Jiangxi has significant convective characteristics, accompanied by obvious thunder and lightning weather. The rain is strong and extreme, and thunderstorm winds of magnitude 8-10 have also appeared in some areas.
In addition, this round of heavy rainfall may also cause a "train effect", that is, a series of convective clouds affecting the same place one after another, just like different carriages of a train passing through the same track one after another, causing heavy rainfall to remain offline for a long time. When encountering the "train effect" in strong convective weather, the public needs to be alert to the superimposed effects of precipitation, wind and hail and other weather conditions.
Zhang Tao suggested that on the way back, the public should be alert to the risks of flash floods, landslides, debris flows and floods in small and medium-sized rivers that may be brought about by heavy precipitation, as well as the wind disaster risks caused by local thunderstorms and strong winds. They should pay close attention to the weather warning information issued by the local meteorological station and take timely measures. measure.
The Paper learned from the Central Meteorological Observatory that the rainfall in Jiangnan and South China is expected to weaken significantly from May 5, but there will still be light to moderate rain or thundershowers in Zhejiang, Fujian, Jiangxi, Guangxi, Guangdong and other places.
