Is the cold front rainfall before or after the front?

After a storm comes a calm. A cold front is the rain behind the front. When cold and warm air meet, the boundary area formed becomes front area or front for short. Because of the different configurations and moving speeds of the cold front and the upper trough, the distribution of clouds and precipitation near the cold front is also obviously different.

Because cold air is heavy and warm air is light, when the cold air mass moves, it will form a cold air mass that actively wedges under the warm air mass, forming a front at the junction of cold and warm air. When a cold front crosses the border, cumulonimbus clouds, thunderstorms and heavy precipitation often occur. If the cold front moves fast, cumulonimbus clouds are distributed in the narrow area in front of the front, and then it will turn from local cloudy to sunny quickly after the front; If the cold front moves slowly, it will form a large range of high-level clouds and nimbostratus.

Where the cold front appears

The cold front is the strongest in winter, which can often directly drive South China and South China Sea, resulting in cold wave weather. The cold front in summer is weak, mainly in the north, and it often brings thunderstorms.

North China is the only place for cold front activities in China. In Northeast China, there are cold fronts all year round, especially in spring and autumn. There are three sources of cold front in these two areas: West Road, Northwest Road and Beibei East Road. The cold front in winter mainly causes cooling and strong winds, and thunderstorms can occur in summer. In spring, cold fronts often cause strong winds and precipitation in Northeast China, but only sandstorms in North China.

Reference to the above content: Baidu Encyclopedia-Cold Front