Why do sandstorms never occur in the southern region where typhoons ravage every year?

Sandstorm refers to a disastrous weather phenomenon that strong winds roll up a lot of dust on the ground, making the horizontal visibility less than 1 km.

We can see from the definition that sandstorms basically have two requirements, one is strong wind, and the other is dust. Of course, the occurrence of sandstorms also requires unstable air conditions. Strong wind is the power source of sandstorm, and the unstable thermal conditions of sandstorm are conducive to the development of strong convection caused by wind, thus carrying more dust and raising it higher. Therefore, the formation of sandstorms requires three conditions, so we can know that these three conditions exist in the northern region, which leads to frequent sandstorms. The northern region is a relatively water-deficient region at first, and the frontal rain belt gradually rains in the process of moving northward, which makes the rain belt reach the northern region with less precipitation and relatively dry climate. In spring, the temperature began to rise, and the evaporation was relatively large. In spring, crops began to be sown, and the water shortage in the northern region intensified. Less precipitation, arid climate, sparse vegetation and low vegetation coverage make the land loose, man-made deforestation and overgrazing intensified in the northern region, which provides a material basis for the occurrence of sandstorms. Then there are strong wind conditions. The northern part of China is close to Mongolia-Siberia high, which makes the winter wind sweep from the north, and the northwest wind of winter and spring monsoon is strong and windy.

Finally, there is a relatively unstable air state in the northern region. When the temperature rises in spring, the low-level temperature is high and unstable, and it is easy to move up. After the wind blows, it will blow up the dust and form a sandstorm. Therefore, sandstorms in the north are generally strongest in the afternoon or from afternoon to night, because this is the most unstable time of the day, which is also the reason why there are many sandstorms in the north in spring. Generally, there will be no sandstorms in the south. There are three reasons for the above sandstorm. In the south, however, the vegetation is well covered, the rainfall is abundant, and the wind is not very strong, so there is generally no sandstorm.