What are the weather characteristics of warm front crossing?

In the process of front movement, if warm air plays a leading role in pushing the front to move to one side of the cold air mass, this front machine is called warm front. Warm fronts are mostly active in northeast China and the middle and lower reaches of the Yangtze River, and are often accompanied by cold fronts. After the warm front crossed the border, the temperature rose, the air pressure dropped, and the weather turned cloudy and rainy.

Warm front weather model:

In the cold air mass under the warm front, stratocumulus and cumulus are often produced under the action of airflow convergence and turbulence because of the humidity of the air. If the raindrops falling from the front warm air evaporate in the cold air mass, the water vapor content in the cold air mass will increase, and when it reaches saturation, cumulus clouds and stratocumulus clouds will be produced. If this saturation condensation occurs in the ground layer near the front line, frontal fog will be formed. The above is the general situation of warm front weather, but when the warm air is unstable in summer, there may be showers such as cumulonimbus clouds and thunderstorms. When the water vapor content in the warm air mass is very low in spring, only some high clouds appear and there is little precipitation.

Because the front is the intersection of cold and warm air masses, the air activity is very active, which can form a series of weather such as clouds, rain, strong winds and precipitation. There are fronts all year round in China, among which cold fronts are the most frequent and can appear in vast areas of the country. At the turn of spring and summer, there are often quasi-static activities. Frontal activities often go through the process of formation, strengthening and extinction. The general medical history is about 3-5 days. The changing process of phenomena with time.