"Weather brought by front, front, cold front, warm front and cold front" and their relationship.

At the intersection of cold and warm air masses, an inclined interface is formed due to the different properties of air masses, which is called front. Generally speaking, because of its low density, the warm air mass often rises to form clouds, thus producing precipitation.

Cold and warm fronts is distinguished according to the initiative of moving cold and warm air masses.

A cold front is a front caused by the active movement of a cold air mass. The warm air mass is forced to rise, and the cold air mass moves fast, which leads to a small frontal dip and drastic weather changes. When a cold front comes, it often brings heavy rain and snow, and the temperature drops and the air pressure rises. Strong cooling weather such as cold wave is generally cold front weather. A cold front is the precipitation behind the front.

The warm front is that the warm air mass climbs along the cold air mass, and the weather changes smoothly. There will be some precipitation before the warm front comes. After the warm front, the temperature rises, the air pressure decreases and the air is moist. For example, the "returning to the south sky" in the southern spring is generally warm front weather.

There is also a quasi-static front, which is because the cold and warm air mass is quite strong, the moving range is not large, and the weather is relatively stable, such as the quasi-static front in Kunming, where the climate is like spring all the year round.

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