20 18 what is the impact of the first large-scale strong convection in south China?

Affected by cold air, the temperature in central and eastern China will gradually drop, and will return to normal or even slightly lower level tomorrow (4-5). At the same time, under the collision of cold and warm air, the south will usher in the first round of large-scale strong convective weather this year. Northeast China, which suffered a new round of heavy snowfall yesterday, has weakened and stopped snowfall today, but the public should strengthen their prevention of the impact of snow and road icing on travel.

Today, the south will encounter the first round of large-scale strong convective weather this year.

It has been raining continuously in the south recently. Today, with the convergence of cold air and warm and humid airflow in the south, the scope and intensity of the rain area in the south have been expanded and strengthened, accompanied by lightning, and there may even be strong convective weather such as thunderstorms and hail in the local area, which will be the first round of large-scale strong convective weather this year. Yesterday, the Central Meteorological Observatory issued the first blue warning of severe convective weather this year.

It is estimated that from 08: 00 on March 4 to 08: 00 on March 5, there will be 8- 10 thunderstorms and local hail weather in parts of southeastern Guizhou, northeastern and southern Hunan, eastern Hubei, southern Anhui, northwestern Jiangxi, western Fujian and northwestern Guangxi.

In addition, some areas in southern Shandong, eastern Jiangsu, southern Anhui, southwestern and eastern Hubei, northern and southeastern Hunan, central and northern Jiangxi, central Zhejiang, northwestern Fujian, northeastern Guangxi and other places have short-term heavy precipitation weather, with an hourly rain intensity of 20 ~ 40 mm and a local area of more than 50 mm. It is expected that the afternoon of the 4 th will be the strongest period of strong convection.

By this evening, as the cold air continues to push forward, the rain area will press south, and the rainfall will weaken at the beginning of next week, and there will still be a new rainfall process in the next 6-7 days.

From a perennial point of view, after entering March, the warm and humid airflow is becoming more and more active, while the cold air in the north is still moving southward. At the same time, the precipitation in the south is increasing, and the atmospheric instability is also high.

In March, the number of rainy days and thunderstorm days in the south will increase greatly. From Jiangnan to northern South China, the number of precipitation days in March will exceed 15, and there will be rain on more than half of the days in a month. The number of thunderstorm days in many places has also doubled.