What weather sign is this?

It is the weather symbol of sandstorm, the yellow one is the weather symbol of sunny day, and the sandstorm symbol: it is a capital S, which means sand, and there is an arrow in the middle to indicate the direction of sandstorm.

Extended data:

Is the sandstorm a sandstorm or a sandstorm? Sandstorm is a sign of desertification. It refers to a disastrous weather phenomenon that strong winds roll up a lot of dust on the ground, making the horizontal visibility less than 1 km. It has the characteristics of suddenness and short duration, low probability and great harm. Sandstorm weather mainly occurs in winter and spring. This is because there is little precipitation in winter and spring in semi-arid and arid areas, the surface is extremely dry and loose, and the wind erosion resistance is very weak. When the wind blows, a lot of dust will be entrained in the air, forming sandstorm weather.

References:

Baidu encyclopedia-sand castle