Why is the summer rainstorm in northern China a frontal rain formed by a cold front?

1, the intensity of cold and warm air mass in cold and warm fronts is different, which determines the type and direction of front. If the cold air mass is strong, it will move actively, which is the cold front. The moving direction of the cold air mass is the same as that of the cold air mass. If the warm air mass is strong, the warm air will move actively and the cold air mass will be forced to retreat. This is a warm front, and the moving direction of the warm air mass is the same as that of the warm air mass.

2. Second, the signs in front are different. ③ The front slope is different. The front slope is the angle between the front and the ground. The angle between the front and the ground is large, indicating that the front has a large slope and is generally a cold front. The angle between the front and the ground is small, indicating that the front slope is small and it is a warm front. Frontal slope is related to frontal moving speed. The cold air mass in the cold front pushes the front to move rapidly, and the warm air mass on it rises strongly, so the front slope of the cold front is large.

3. When cold and warm fronts transits the border, the weather changes differently. When a cold front crosses the border, there are often weather phenomena such as strong wind, cloudy weather, precipitation and cooling. After the cold front crossed the border, the cold air mass replaced the warm air mass, so the air pressure increased, the temperature and humidity decreased, and the weather turned fine. When the warm front crosses the border, there are often weather phenomena such as cloudy and rainy. After the warm front crossed the border, the warm air mass replaced the original position of the cold air mass, so the air pressure.

4. The rain areas in cold and warm fronts are different. The cold front precipitation is concentrated behind or near the front, and the rain area is narrow. The warm front precipitation is in front of the front, and the rain area is wide. It is difficult to look at the map in front, so the teacher should strengthen guidance here.

5. cold and warm fronts transit, resulting in different precipitation characteristics. Because the cold front moves fast, the precipitation intensity is high and the duration is short. Because the warm front moves slowly, the precipitation intensity is small, and the duration is long and continuous.

6. cold and warm fronts has different influences on the weather in China. The heavy rain in summer and cold wave in winter in northern China are mainly caused by the transit of cold front. Therefore, the cold front has a great influence on the weather in China, while the warm front has little influence and does not occupy an important position.