The first step for the meteorological department to make a weather forecast is to make a weather situation forecast, that is, to move and adjust the weather system that currently controls and affects

The first step for the meteorological department to make a weather forecast is to make a weather situation forecast, that is, to move and adjust the weather system that currently controls and affects the forecast area. (1) is located in the northern hemisphere; The wind at a deflects to the right (the front moves counterclockwise).

(2) Before the cold front crosses the border, it is southwest wind, and after the cold front crosses the border, it is northwest wind, and the wind speed becomes larger.

(3) When the cyclone moves from land to sea (due to the decrease of friction), the wind speed will increase and the angle between the wind direction and the isobar will decrease.