What is the ups and downs weather?

Floating dust weather is the sandstorm with the lowest intensity. It is caused by the generation and transmission of sandstorms in distant places or the local generation of blowing sand. When the intensity weakens and the coarse particles in the dust settle by gravity, the fine particles continue to be transported and float. Weather phenomena formed in the air. When the wind speed continues to decrease, the suspended dust particles will settle to the ground, so it is commonly known as "falling yellow sand".

In dusty weather, distant objects appear earthy yellow and the sun appears pale or light yellow; the wind speed is not very high, level 4 or lower; the visibility is less than 10 kilometers and greater than 1 kilometer. Floating dust and dust fall deteriorate the surrounding environment and have an important impact on human health, especially the respiratory system.

Region:

The area where dust weather occurs is similar to that of sandstorms, but the scope is larger. In China, sandstorms and floating dust weather mainly occur in the northwest arid areas, deserts and Loess Plateau. In winter and spring, due to the strong wind transport of cold air from the northwest, sandstorms and floating dust weather can occur in most areas of northern my country.

When a sandstorm begins to occur, there may be strong updrafts at the same time. Some of the sand and dust may enter the upper air, undergo long-distance transport by jet streams, and then descend to form floating dust weather. Therefore, there have been reports of dusty weather in southern my country, such as Nanjing, Shanghai, Chengdu, Lhasa and other places.

Reference for the above content: Baidu Encyclopedia - Floating Dust