What kind of weather system is a sandstorm? What are the degrees of sandstorm weather?

The main components of a sandstorm are soil and yellow sand. A sandstorm is a general term for sandstorms and dust storms. It refers to a sudden and short-lived disastrous weather phenomenon with a low probability and high harm. Next, let's take a closer look at the degrees of sandstorm weather.

Contents of this article

1. What kind of weather system is a sandstorm?

2. What are the degrees of sandstorm weather?

3. Which is more harmful, smog or sandstorms?

What is a sandstorm?

Sandstorms belong to the cold front weather system. There are three elements for the formation of sandstorms, namely strong winds, sand sources and unstable air. In addition to these three factors, factors such as human production activities are also very important for the formation of sandstorms.

Dust storm is a general term for sandstorms and dust storms. It is a sign of desertification and refers to a disastrous weather phenomenon with low probability and high harm, in which strong winds blow up large amounts of sand and dust from the ground, making horizontal visibility less than 1 km. It is characterized by suddenness and short duration.

What are the degrees of sandstorm weather?

1. Floating dust refers to the weather phenomenon in which sand and dust float in the air and the horizontal visibility is less than 10,000 meters when there is no wind or the average wind speed is less than or equal to 3.0 meters per second.

2. Blowing sand refers to a weather phenomenon in which the wind blows up sand and dust on the ground, the air is very turbid, and the horizontal visibility is less than 1,000 meters.

3. A sandstorm refers to a weather phenomenon in which strong winds blow up sand and dust on the ground, the air is extremely turbid, and visibility is less than 1,000 meters.

4. A severe sandstorm refers to a weather phenomenon in which strong winds blow up sand and dust on the ground, the air is extremely turbid, and the horizontal visibility is less than 500 meters.

5. An extremely severe sandstorm refers to a weather phenomenon in which strong winds blow up sand and dust on the ground, the air is extremely turbid, and the horizontal visibility is less than 50 meters.

6. Yellow sandstorm warning: Sandstorm weather may occur within 24 hours (visibility less than 1000 meters) or sandstorm weather has occurred and may continue.

7. Orange warning for extremely severe sandstorms: Severe sandstorm weather (visibility less than 500 meters) may occur within 12 hours, or strong sandstorm weather has already occurred and may continue.

8. Red alert for extremely severe sandstorm: Extremely severe sandstorm weather (visibility less than 50 meters) may occur within 6 hours, or extremely severe sandstorm weather has already occurred and may continue.

Which is more harmful, smog or sandstorm?

At the same concentration, fine particles in the air are more harmful than coarse particles. The average particle size of particulate matter in the air during haze is much smaller than that of sandstorms, so at the same concentration, haze is much more harmful than sandstorms.

Compared with haze, the main components of sandstorms are soil and yellow sand. The dust particles in the soil will mainly increase the PM10 content in the air. PM10 can enter the upper respiratory tract, but some of it can be excreted from the body through sputum, etc., and it will also be blocked by the villi inside the nasal cavity.

Haze, also known as atmospheric brown cloud, is a weather phenomenon called haze weather when a large number of extremely fine dry dust particles float evenly in the air, causing the air to become turbid, making the horizontal visibility less than 10 kilometers, and the relative humidity less than or equal to 80%. When haze weather occurs, bright objects in the distance will be slightly yellow or red, and dark objects will be slightly blue. Haze is generally formed when there is no obvious air activity, the wind direction changes from north to south, there is an inversion layer (a stable air layer with warm air on the top and cold air on the bottom) in the low altitude, and there is no wind or light wind.