Formation of mud rain

In the desert edge area in spring, due to long-term drought, there is little vegetation coverage on the surface. When there is strong wind, the dust on the surface is easily blown up and transported away. However, due to the large particle size of sand, it is not easy to form suspension and cannot be transported over a long distance, which is the main reason why there is only dust and little sand blowing in areas far away from dust.

If the gale lasts for a long time, the suspended floating dust can be transported far away, and sandstorms will appear in the passing areas; When the wind speed decreases to a certain extent, the floating dust will fall, and there will be dust-falling weather in the local area. If it rains at this time, the so-called "mud rain" will form.

Extended data

Beijing was suddenly attacked by "mud rain";

2021April 15, this day in Beijing, from the bright sun in the morning to the sudden yellow sand in the afternoon, accompanied by rain, this change was unpredictable, and pedestrians and cars on the road seemed to be unearthed cultural relics.

Intermittent light rain in Beijing, with dust, falls on roadside parking and pedestrians, forming mud spots. Netizens joked that "Beijing is muddy", "the money for washing the car yesterday was wasted" and "there is still a queue for washing the car".

Baidu encyclopedia-mud rain