Traditional Culture Encyclopedia - Weather forecast - What kind of weather sign is this?

What kind of weather sign is this?

This is a sign of "sandstorm weather"

It means that strong winds blow up a lot of dust on the ground and drag it into the air, making the air particularly turbid and the horizontal visibility less than.

One kilometer of severe sandstorm weather phenomenon.

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Relevant meteorological symbols: S is floating dust weather, and the vertical arrow in the middle of S is sand blowing weather.

The arrow to the right in the middle of S indicates sandstorm weather, and the double arrow to the right in the middle of S indicates strong sandstorm weather.