Guangdong Dragon Boat Water Time Defense Guide Where is the rainstorm-prone area in South China?

After the Dragon Boat Festival, the rainstorm in Guangdong affected everyone's travel, and it was common for flights to be cancelled and roads to accumulate water. What Bian Xiao wants to say below is the relevant defense strategy of this dragon boat water. Everyone should pay more attention to related matters.

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In 2008, there was a period of concentrated precipitation in the first flood season in Guangdong, with continuous heavy rain, heavy rain and even heavy rain. Because the Dragon Boat Festival is the time for dragon boat racing, it is called "Dragon Boat Water" by the people, and it is the "last madness" in the first flood season in South China.

For the convenience of statistics, "dragon boat water" generally refers to the precipitation from May 2 1 day to June 20.

It is understood that the cause of "dragon boat water" is related to summer monsoon and cold air. Around the Dragon Boat Festival, the weather in South China is the most complicated period. The cause of dragon boat water is closely related to the alternating changes of winter and summer monsoon in the South China Sea. Generally speaking, the South China Sea summer monsoon breaks out in May. After the onset of monsoon, its propulsive force affects South China and produces monsoon convective precipitation. At the same time, the cold air in the north is reluctant to part with South China.

After May every year, the warm and humid air flow from the tropical ocean has been continuously strengthened, and the temperature in the area south of Nanling Mountains has gradually increased, and the weather has turned hot. However, cold air is never willing to "retreat northward", and the combination of cold and warm air causes frontal precipitation. Therefore, under the combined influence of monsoon precipitation and frontal precipitation, large-scale concentrated precipitation, namely "Dragon Boat Water", often occurs in Guangdong from late May to mid-June.

The formation mechanism of rainstorm is quite complicated, but there are two important macro conditions:

First, there must be rich sources of water vapor; Second, there must be strong updraft and favorable atmospheric circulation situation, so that the intensity and duration of precipitation are large enough.

Coincidentally, before and after the Dragon Boat Festival every year, when South China is affected by the frontal trough, these two conditions are easy to meet, so heavy rain and "dragon boat water" are in an outbreak state.

National defense guide

Where is the rainstorm in the south easy to flood?

According to the waterlogging risk warning issued by the Central Meteorological Observatory today (12), due to the rainy weather in southern China for several days, the waterlogging risk level in many places is high. Which places are prone to waterlogging under heavy rain in the south? There are waterlogging risks in western Fujian, south-central Jiangxi, southern Hunan, northern Guangdong and Shenzhen.

The Central Meteorological Observatory released the waterlogging risk weather forecast on June 2 18:

Affected by rainfall, it is estimated that from 20: 00 on June 12 to 20: 00 on June 13, the flood risk levels in western Fujian, south-central Jiangxi, southern Hunan, northern Guangdong, Shenzhen, northeastern Guangxi and eastern Yunnan are high. Among them, western Fujian, eastern Jiangxi, northern Guangdong and other places have high waterlogging risk levels, which are easy to form urban waterlogging and farmland waterlogging, so it is necessary to strengthen prevention.