What is the impact of crossing ahead on the climate?

I. Front Type and Weather Control According to the moving direction of cold and warm air masses on both sides of the front, the front can be divided into cold front, warm front and quasi-static front. According to the moving speed of cold air mass, cold front can be divided into fast cold front and slow cold front. Four types of fronts, except the fast-moving cold front will bring storms, other fronts will bring continuous precipitation when crossing the border. When the cold and warm air masses are evenly matched, or encounter terrain obstacles, the front moves slowly, or swings in an area for a long time, resulting in rainy weather. This kind of front with small moving amplitude is called quasi-static front. Examples: ① Early summer (June), rainy weather from the middle and lower reaches of the Yangtze River to southern Japan; (2) In the winter half year, the southward cold air was blocked by Yunnan-Guizhou Plateau, and the cold front came to a quasi-static stop between Kunming and Guiyang, forming a quasi-static stop front in Kunming. Second, the interpretation method of cold and warm front 1 According to the definition of cold and warm front, judge who is the most powerful and who is the main force of cold and warm air movement. The warm front is that the warm air mass climbs actively, and the cold front is that the cold air mass cuts into the lower part of the warm air mass actively. 2. Judging from the moving direction of the front: as shown on the right, if the front moves from A to B, it means that the warm air mass has defeated the cold air mass, and the front is a warm front; If the front moves from B to A, it means that the cold air mass has defeated the warm air mass, and the front is a cold front. 3. From the moving direction of the cold air mass, as shown in the figure, the warm air mass climbs upward, but the moving form of the cold air mass is different. The cold air mass at the warm front is forced to turn around, and the cold air mass at the cold front does not turn around. 4. Judging from the steepness of the front, the angle between the cold front and the ground is greater than that between the warm front and the ground. 5. From the position of rainfall relative to the front, as shown in the above figure, rainfall mainly occurs on the side where the included angle between the front and the ground is small, or on the side of the cold air mass. Whether precipitation is before or after the front is judged according to the moving direction of the front. For example, the cold front map shows that the cold air mass is stronger than the warm air mass, and the cold front will move eastward. Compared with the moving direction of the front, the precipitation is behind the front, and sometimes there is a little precipitation before the cold front, which may be because of the wind (sweeping rain); Similarly, warm front precipitation only appears in front of the front.

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