What do the weather forecast three arc labels mean?

The three arc icons in the weather forecast are blowing sand.

Sand blowing is caused by local or nearby dust being blown by the wind. Visibility dropped significantly, and the sky was cloudy and yellow when it appeared. The north is easy to appear in spring. The wind is strong in sand-blowing weather, which affects the visibility between 1 km and1km.

Dust weather is a disastrous weather phenomenon in northern China (especially in northwest China) in spring. This kind of weather can be divided into three levels according to the horizontal visibility, namely floating dust, sand blowing and sandstorm.

Sand blowing and sandstorm are both caused by the violent activity of large air flow, which brings up the surface dust in a specific area. Its * * * characteristics are obviously reduced visibility and cloudy sky. It mostly happens when cold air passes through the border in northern spring, but the difference is that the visibility affected by sand blowing weather is between 1 km and 10 km. The visibility of sandstorm and windy weather is even less than 1 km.

Extended data:

As a sandstorm disaster, sand blowing does not happen in all windy places, but only in those areas with dry climate and sparse vegetation. Sand blowing mostly occurs in April-May every year. Mainly distributed in the western and northern regions, Inner Mongolia, Tibet and Xinjiang are the most serious.

National defense guide

1. The government and relevant departments should do a good job in gale prevention according to their duties.

2. Close the doors and windows, reinforce the structures that are easy to be blown by the wind, such as hoardings, scaffolding and billboards, properly arrange outdoor items that are easily affected by strong winds, and cover building materials.

3. Pedestrians should take care to ride bicycles as little as possible, and don't stay under billboards and temporary structures when it is windy.

4. Relevant departments and units attach importance to forest fire prevention.