The following figure shows the ground weather map of a certain area on April 6, 2006 17, and the dotted line shows the real-time distribution of some meteorological disasters caused by the weather sys

The following figure shows the ground weather map of a certain area on April 6, 2006 17, and the dotted line shows the real-time distribution of some meteorological disasters caused by the weather system. As can be seen from the picture, this place is in the northwest, with dry weather and little precipitation. The weather before the cold front is controlled by the warm air mass, with high temperature, low air pressure and dry weather. The strong wind brought by the cold front blows the sand from the sand source into the sky, affecting the area where the cold wind passes.