What does the sand-blowing weather represent?

Sand blowing weather refers to the weather phenomenon in which local or nearby dust is blown by the wind.

Sand blowing is caused by local or nearby dust blown by the wind, and the dust concentration in different directions is inconsistent. Most of the floating dust is diffused by high-altitude airflow in the distance, or formed by fine particles suspended in the air after sandstorm and sand blowing, and the dust content in all directions is relatively uniform. The appearance of floating dust always lags behind sand blowing, that is, when floating dust appears, it must be sand blowing or sandstorm in remote or local areas. If it is local sand blowing, then the sand blowing phenomenon must have ended when floating dust is recorded.

The visibility level of sand blowing in different directions is often inconsistent, and sometimes it has little effect on vertical visibility. When people are outdoors, dust particles often give people a feeling of hitting their faces, and doors and windows sometimes crack. People walk against the wind, and dust and fine sand strongly stimulate people's eyes.

When floating dust appears, the visibility level in all directions is basically the same, which definitely has a great influence on the vertical visibility, making the sky unclear and often making observers mistakenly think that cirrostratus exists. When people are outdoors, small dust particles will not cause the feeling of hitting people's faces.

The difference between blowing sand and sandstorm;

The difference between sand blowing and sandstorm is that most of them occur when cold air passes through the border in northern spring. The difference is that the visibility affected by sand-blowing weather is between 1 km and1km. The visibility of sandstorm and windy weather is even less than 1 km. Sandstorm weather is a disastrous weather phenomenon in northern China (especially in northwest China) in spring. This kind of weather can be divided into three levels according to the horizontal visibility, 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.

Please refer to Baidu Encyclopedia-Yang Sha for the above contents.