Traditional Culture Encyclopedia - Weather inquiry - What are the five grades of dusty weather?
What are the five grades of dusty weather?
1, floating dust
Floating dust refers to the weather phenomenon that the dust with horizontal visibility less than 10 km floats in the air for 4 seconds under the condition of no wind or the average wind speed is less than 3.0 meters.
Step 2 blow sand
Sand blowing refers to the weather phenomenon that the wind blows up the dust on the ground, making the air quite turbid and the horizontal visibility is within the range of 1 km- 10 km.
Step 3: sandstorm
Sandstorm refers to the weather phenomenon that strong winds blow up dust on the ground, making the air very turbid and the horizontal visibility less than 1 km.
4. Strong sandstorm
Strong winds blow up the dust on the ground, making the air very turbid and the horizontal visibility less than 500 meters.
5. Extremely strong sandstorm
Strong winds blow up dust on the ground, making the air particularly turbid, and the horizontal visibility is less than 50 meters.
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