What does the sandstorm icon look like?

The sandstorm icon is represented by an "S".

Sandstorm icons usually come in two forms. One is a yellow triangle, similar to a warning sign, with a black human-shaped pattern on it, indicating that people need to pay special attention to protect themselves in sandstorms. The other is a yellow circle with a black cyclone shape in the middle, indicating that a sandstorm is occurring.

These icons usually appear in weather forecasts or in meteorological information columns in public places to remind people to pay attention to the impact of sandstorms. "S" means floating and sinking, an upward arrow on the "S" means blowing sand, and an arrow pointing to the right means a sandstorm. A sandstorm refers to a weather phenomenon in which strong winds blow up a large amount of dust and sand from the ground, making the air very turbid and the horizontal visibility less than 1 kilometer.

Necessary conditions for the formation of sandstorms

1. Sand and dust

The sand and dust on the ground are the material basis for the formation of sandstorms. The sand and dust in desert areas are the The main source of dust. Sand and dust materials will only be carried away by strong winds when they are dry and loose and easy to transport. Sand particles in a consolidated state or dust with high humidity are not conducive to wind transport.

2. Strong winds

Sandstorms use wind as the driving force for transportation. Strong winds (wind speed near the ground exceeds level 6, about 12 meters/second) are the driving force for long-distance transportation of sandstorms. Or more frequent and stronger winds from the source area are necessary conditions for the formation of sandstorms. In terms of wind speed, the wind speed is high in spring and low in summer, autumn and winter, so spring is the season when sandstorms occur most frequently.