Typhoon Sura will move southwest along the coast of Guangdong at a speed of 15-20km/h, and its intensity will gradually weaken. Typhoon landing does not mean that the danger is lifted, and the storm impact of Sura on Guangdong will continue. Please pay attention to the latest forecast and early warning information and continue to do a good job in defense.
3 1 from night to September 3, there were heavy rains to heavy rains in cities and counties in eastern Guangdong, southern Meizhou, southern Heyuan and central and southern Pearl River Delta, and there were thunderstorms in other cities and counties. 3 1 From the night to September 2, the wind in the eastern coastal cities and counties gradually increased to 8 ~ 10, and the gust 165438. The cyclone wind force 13 ~ 15 and gust 16 in the nearby cities and counties where the typhoon center passes. From September 2 to 4, there was an obvious wind and rain process in the southern cities and counties of Guangdong Province.
Causes of typhoon formation
The formation of typhoon requires the following conditions: the sea surface water temperature is above 26.5℃; Initial disturbance of a positive vorticity; The shear of ambient wind in the vertical direction is very small; Low pressure or cloud disturbance is at least several latitudes from the equator.
Because people don't fully understand the formation of typhoons now, the above list is only a necessary condition for the formation of typhoons. The initial stage of typhoon is tropical depression. From the initial low-pressure circulation to the maximum average wind force near the center, it usually takes about 2 days, the slow one takes three or four days, and the fast one takes only a few hours.
In the development stage, the typhoon continuously absorbs energy until the central air pressure reaches the lowest value and the wind speed reaches the maximum value. However, after the typhoon lands on land, it will quickly weaken and disappear under the joint influence of ground friction and insufficient energy supply.