Weather changes before and after warm front crossing the border

Weather changes during warm front transit.

1, before crossing the border: controlled by a single cold air mass, with low temperature, clear weather and high pressure;

2. When crossing the border: it is warm and humid, the temperature rises, the air pressure drops, and the weather turns cloudy and rainy;

3. After crossing the border: controlled by the heated air mass, the temperature rises, the air pressure decreases, the relative humidity decreases, the wind turns clockwise, and the weather turns from cloudy to sunny.