Conditions for the formation of geographical sandstorms in senior high schools

There are six conditions for the formation of sandstorms.

First, the dust on the ground is the material basis for the formation of sandstorms.

Second, strong wind is the dynamic basis for the formation of sandstorms, and it is also the dynamic guarantee for the long-distance transportation of sandstorms.

3. The air state is unstable, which is an important local thermal condition. Sandstorms mostly occur in the afternoon and evening, which shows the importance of local thermal conditions.

Fourthly, in the arid climate, sandstorms mostly occur in spring in the north, which is a good evidence that sandstorms will not occur for a period of time after rainfall.

5. In addition, drought and lack of rain in the early stage, warmer weather and rising temperature are the special weather and climate background for the formation of sandstorms; The convective cells before the ground cold front develop into clouds or squall lines, which is a small and medium-sized system conducive to the development and strengthening of sandstorms. The topographic condition conducive to the increase of wind speed, that is, the narrow tube effect, is one of the favorable conditions for the formation of sandstorms.

6. In addition, the favorable weather situation, favorable distribution of dust sources and favorable air instability conditions are the main reasons for the formation of sandstorms or strong sandstorms. Strong wind is the driving force of sandstorm, and the source of sandstorm is the material basis of sandstorm. Unstable thermal conditions are conducive to the increase of wind power and the development of strong convection, thus carrying more dust and winding it higher.