What are the main disastrous weather in China?

Reason:

1 Drought: In spring, the temperature rises rapidly, evaporation is vigorous, and precipitation is insufficient. Unreasonable reclamation reduces the surface vegetation coverage and water conservation capacity.

The main hazards are: drinking water for people and livestock, dead plants and barren land.

Flooding: Precipitation is concentrated in summer, with great changes and heavy rainfall. Unreasonable reclamation reduces the surface vegetation coverage and water conservation capacity. As a result, soil erosion is aggravated, sediment deposition and flood discharge capacity are reduced. In the dry season, especially in spring.

Hazards: affecting people's lives, destroying traffic and buildings, flooding farmland factories, etc.

Sandstorm: the temperature rises rapidly, evaporation is vigorous, and the surface is dry and easy to sand; It is windy in spring. Unreasonable reclamation and sandy wasteland make sandstorms rampant.

Typhoon: it is a strong storm that occurs in the tropical oceans of the northwest Pacific Ocean and the South China Sea. You must have seen a vortex appear in the river from time to time. In fact, a typhoon is an air vortex, which rotates around its center in the atmosphere and moves forward at the same time. It rotates counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. Meteorology calls the vortex in the atmosphere a cyclone, because the vortex in the typhoon atmosphere is produced on the surface of the tropical ocean, so it is called a tropical cyclone.

Hazard: Destroy buildings, bring rapid precipitation, and cause floods and geological disasters.

Cold wave: The cold wave invading China mainly broke out in the Arctic, Siberia, Russian and Mongolian. Most of these areas are located in the Arctic. In winter, there is no sunshine for a long time, and there is snow and ice everywhere. The air mass staying in these areas is getting colder and drier, as if it were lying in a large natural freezer. When this cold air mass accumulates to a certain extent and the air pressure in the south increases to a much higher level, it is like a flood stored in the mountains. At the first opportunity, it floods to the south with lower air pressure, forming a cold wave. In places hit by cold waves, the wind direction often changes rapidly, the wind speed increases, the air pressure suddenly rises, the temperature drops sharply, and there may be rain, snow and frost. The cold wave goes south, and windy and dusty weather often occurs in northwest, Inner Mongolia and North China. In the area north of Huaihe River, there is generally little rain and occasional snowfall. After crossing the Huaihe River, the chances of precipitation increase.