What is the difference between the rainy season precipitation in western China in 20021year and the normal year?

The precipitation in 202 1 rainy season in western China is 60mm different from normal.

Factors affecting precipitation

1, location: mainly the influence of land and sea location on precipitation, usually the mainland is dry and rainy.

2. Atmosphere: It mainly includes the influence of atmospheric circulation, front, cyclone and anticyclone on precipitation.

3. Terrain: there is more precipitation on windward slope and less precipitation on leeward slope; High terrain will also prevent water vapor from entering. For example, the reason for the dry climate in Xinjiang is not only the inland depths, but also the blocking of water vapor by the surrounding mountains.

4. Ocean current: Warm current can warm and wet coastal climate; The cold current flowing through the coastal climate can reduce temperature and humidity. For example, the desert in Australia extends to the vast area on the west coast of the mainland, which is not only controlled by the subtropical high, but also affected by the trade winds and the cold current in Western Australia. For another example, the seaports of Britain and Norway benefit from the warm current of the North Atlantic because they are not frozen all year round.

5. Vegetation and hydrological conditions: in areas with high vegetation coverage and around lakes, swamps and reservoirs, the air humidity is relatively high and the relative precipitation is relatively high.

In 2023, the average temperature is expected to be around 17.0℃; The annual total precipitation is about 850 mm. In winter, there are frequent cold air activities, strong forces and large temperature fluctuations, and extreme low temperature events may occur. Dry in winter is not obvious; There is generally a spring drought of about 30 days in spring; There is no flood in early summer, and there is a moderate summer drought for about 30 days.

The rainstorm started slightly later, in the middle and late May; There was no continuous rain during the double robbery. The rainstorm process in flood season is concentrated, with about 5 regional rainstorm weather processes, local heavy rain, general flood and partial pressure; The general summer drought lasts for about 25 days, accompanied by staged high temperature weather, and the high temperature intensity is close to normal. There is no low temperature weather in early autumn, and cotton rain is slightly heavier in autumn.

In the middle and late May; There was no continuous rain during the double robbery. The rainstorm process in flood season is concentrated, with about 5 regional rainstorm weather processes, local heavy rain, general flood and partial pressure; The general summer drought lasts for about 25 days, accompanied by staged high temperature weather, and the high temperature intensity is close to normal. There is no low temperature weather in early autumn, and cotton rain is slightly heavier in autumn.