Causes of frequent rainstorms in Guangzhou

In China, the water vapor of rainstorm comes from the South China Sea or the Bay of Bengal. Second, from the East China Sea or the Yellow Sea. Sometimes, in a rainstorm, water vapor comes from the east and south, or mainly from the south in the early stage and from the east in the later stage. The spread of "southeast wind, rain ancestor" in the Central Plains is an objective reflection of the precipitation law. 20 10 may, Guangzhou airport bus was "flooded". Like running water, the motion of the atmosphere often produces fluctuations or eddies. When two air streams from different directions or different temperatures and humidity meet, fluctuations or vortices will occur. The largest is several meters in Qian Qian, and the smallest is only a few kilometers. In these fluctuating areas, with the operation of air flow, upward movement often occurs, and horizontal water vapor quickly concentrates in the same area, forming a rainstorm center. In addition, topography also has an influence on the formation of heavy rain and rainfall. For example, due to the existence of mountains, the airflow is forced to rise on the windward slope, which increases the vertical movement and the rainstorm; On the leeward slope of the mountain range, the airflow sinks and the rainfall is greatly reduced. On some leeward slopes, the rainfall is only110 of windward slopes. In early August, at 1963, there was a wet air flow from the South China Sea to North China, which happened to intersect with Taihang Mountain. Due to the uplift of the mountain range, there is a rare rainstorm in the east of Taihang Mountain. The narrow tube action of the valley can also strengthen the rainstorm. 1In August, 975, a torrential rain occurred in Henan Province. Its center, Zhuang Lin, is surrounded by mountains in the south, north and west, and gradually forms a trumpet-shaped terrain in the east. Due to this terrain, the airflow rises faster and the rainfall suddenly increases. From August 5 to 7, the precipitation reached 1600 mm or more, and Zhumadian, which is located in the plain area, is less than 40 kilometers southeast of Zhuanglin. In addition, when the rainstorm occurs, the lower air is generally warm and wet, while the upper air is dry and cold, which makes the atmosphere in an extremely unstable state, which is conducive to the release of energy in the atmosphere and the full development of cumulonimbus clouds.