How to distinguish between cold and warm fronts and how will the weather change before and after crossing the border?

A cold front is a cold air mass pushing a warm air mass, and a warm front is a warm air map pushing a cold air mass. The simplest way to distinguish: the cold front rainfall is behind the front and the warm front rainfall is before the front. The cold front precipitation is behind the front, and the precipitation area is relatively narrow; The warm front precipitation is before the front, and the precipitation area is relatively wide.

After the cold front:

1, temperature: falling, controlled by cold air mass.

2. Air pressure: decrease first and then increase.

3. Weather: It's sunny.

After the warm front crosses the border:

1, the temperature rises, and the position of cold air mass is replaced by warm air mass.

2, atmospheric pressure drop

3. The weather becomes cloudy