How long does Guangdong Dragon Boat Water last? How is dragon boat water formed?

Since the May Day holiday, Guangdong, especially Guangdong and Guangxi, has felt heavy rain. By the heavy rain of the Dragon Boat Festival, dragon boat water began to arrive. Every year, there is always a period of heavy rain in South China. Do you know anything about dragon boat water?

Brief introduction of dragon boat water

Generally speaking, the annual precipitation from May 2/KLOC-0 to June 20 in Gregorian calendar is called "Dragon Boat Water". During this period, all processes with precipitation of 100mm and daily rainfall of 50mm were recorded as "dragon boat water" processes.

The "Dragon Boat Water" season is prone to continuous and extremely heavy precipitation, so it is necessary to guard against mountain torrents, waterlogging and geological disasters.

Dragon Boat Festival is one of the traditional festivals in China, and its related customs and activities are widely known, such as "Dragon Boat Race" and "Dragon Boat Race". At this time, it is the dragon boat race, and precipitation is closely related to the dragon boat, which can be said to be the product of the combination of weather phenomena and traditional festivals. The so-called "dragon boat water" does not refer to the water in the waters where dragon boat races are held, but a weather phenomenon that affects South China and other places.

Name: It coincides with the Dragon Boat Festival.

"Dragon Boat Water", also known as "Duanyang Water", "Dragon Precipitation" and "Dragon Boat Water", generally refers to the precipitation process with heavy rainfall and concentration in South China from late May to early June every year. For the convenience of statistics, meteorological departments generally refer to the precipitation from May 2/KLOC-0 to June 20 as "Dragon Boat Water".

The cause of "Dragon Boat Water" is closely related to the alternating changes of winter and summer monsoon in the South China Sea. In terms of time, the time around the Dragon Boat Festival is the most complicated period of weather change in South China. Usually, the South China Sea summer monsoon breaks out in mid-May. After the onset of monsoon, its propulsive force affects South China and produces monsoon convective precipitation.

How is "Dragon Boat Water" formed?

"Dragon Boat Water" is a rainstorm process in the final analysis. First, we must understand how the rainstorm is formed.

The formation mechanism of rainstorm is quite complicated, but there must be 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, these two conditions are just met around the Dragon Boat Festival every year.