What weather symbols are the three hooks?

The three horizontal bar hooks are symbols for blowing sand, as shown in the figure below. Sand blowing refers to the weather phenomenon caused by local or nearby dust being blown by the wind.

Visibility is obviously reduced during sand blowing, and the sky is cloudy and yellow when it appears. The north is easy to appear in spring. The wind is strong in sand-blowing weather, which affects the visibility between 1 km and1km.

Extended data:

1, weather graphic symbols In order to facilitate public understanding and recognition, a set of graphic images representing weather phenomena has been formulated for use by TV or other public media.

2、? The three horizontal lines represent the "fog" that often brings disasters to aviation, navigation and road transportation. Refers to a large number of water droplets or ice crystal particles suspended in the air near the ground. When this aggregate reduces the horizontal visual distance below 1000 meters, it is called fog; When the visible distance drops to 1000 ~ 10000 meters, it is called light fog.