What's the difference between sandstorm and blowing sand? Which is more harmful?

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.

So sandstorms are more harmful.

1. Sandstorm is a general term for sandstorm and sandstorm. It refers to a severe sandstorm weather phenomenon in which strong winds blow and drag a large amount of sand and dust on the ground into the air, making the air particularly turbid and the horizontal visibility less than one kilometer. Among them, sandstorm refers to a sand-laden storm formed by strong winds blowing a large number of sand near the ground; Sandstorm is a storm formed by strong winds, which brings a lot of dust and other particles into the sky.

Basic grade

Sandstorm intensity is divided into four grades:

1, 4 ≤ wind speed ≤ 6,500m ≤ visibility ≤ 1000m, which is called weak sandstorm;

2, 6 ≤ wind speed ≤ 8,200 meters ≤ visibility ≤500 meters, which is called medium-intensity sandstorm;

3, the wind speed is greater than 9, and the visibility below 50 meters is less than 200 meters, which is called a strong sandstorm;

4. When it reaches its maximum intensity (instantaneous maximum wind speed ≥ 25m/s, visibility ≤ 50m, or even reduced to 0m), it is called a particularly strong sandstorm (or black storm, commonly known as "black wind").

classify

grading

Dust weather is divided into four categories: floating dust, sand blowing, sandstorm and strong sandstorm.

Floating dust: a weather phenomenon in which dust and fine sand float evenly in the air, making the horizontal visibility less than 10 km;

Sand blowing: a weather phenomenon in which the wind blows up dust on the ground, making the air quite turbid and the horizontal visibility is within the range of 1 km to1km;

Sandstorm: a weather phenomenon in which strong winds blow up a lot of dust on the ground, making the air very turbid and the horizontal visibility is less than 1 km;

Strong sandstorm: a weather phenomenon in which strong winds blow up dust on the ground, making the air fuzzy and turbid, and the horizontal visibility is less than 500 meters;

Super sandstorm: a weather phenomenon in which strong winds blow up dust on the ground, making the air particularly turbid and the horizontal visibility is less than 50 meters.

Divide by process

Sandstorm weather process can be divided into four categories: floating dust weather process, sand blowing weather process, sandstorm weather process and strong sandstorm weather process.

Floating dust weather process: in the same weather process, at the same observation time, floating dust weather occurred in five or more countries in China weather forecast area;

Sand blowing weather process: In the same weather process and the same observation time, sand blowing weather occurs in five or more countries in China weather forecast area;

Sandstorm weather process: in the same weather process, sandstorms occurred in three or more countries in China weather forecast area at the same observation time;

Strong sandstorm weather process: In the same weather process, three or more countries in China weather forecast area basically (quasi) stood at the same observation time and experienced strong sandstorm weather.

Second, 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.

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

Sand blowing is because the wind blows up dust or sand on the exposed ground. The visibility of this weather is between 1 km and1km, which is called sand blowing weather. The difference between sand-blowing weather and dusty weather is that some dust is generated in situ and some is blown from other places.

The dust suspended in the atmosphere causes the horizontal visibility of the atmosphere to be less than 10 km.

The dust on the ground is blown up by the strong wind, which makes the air quite turbid, and the horizontal visibility is 1 ~ 10 km.

Dust storms and strong winds blow up the dust on the ground, making the air very turbid, and the horizontal visibility is less than 1 km. When the horizontal visibility is less than 500 meters, it is a strong sandstorm.