crosswind

On both sides of the front, the temperature and meteorological factors have the greatest difference.

There are significant differences in meteorological factors such as temperature, air pressure and wind direction on both sides of the front. Take the temperature as an example. Usually, the temperature difference within the air mass 100 km horizontal distance is 1-2℃, while the temperature difference near the front sometimes reaches about 10℃. At the same time, because the upper part of the front is a warm air mass and the lower part is a cold air mass, a special phenomenon-inversion temperature often appears in the vertical direction.

The weather near the front changes dramatically. Because there is a slope on the front, when the cold and warm air masses meet, the warm air mass rises along the slope. The warm air mass cools in the process of rising, and the water vapor inside is easy to condense, forming rainy weather. The front is the product of interdependence and opposition between cold and warm air masses. In the confrontation between two kinds of air masses, usually one side has the upper hand. The nature of the front is determined by the main air mass.

Front:

Front refers to the interface where cold and warm air meet (named after cold and warm air meet). The intersection of the front and the ground is called "front". Fronts and fronts are often called "fronts" in meteorology. The weather near the front changes dramatically, so when the front passes, there are often strong winds and precipitation. After the confrontation between cold and warm air, when the cold air is stronger than the warm air, the cold air pushes the front to move to the warm air area, and the front at this time is called "cold front".

According to the different primary and secondary positions of cold and warm air masses, they can be divided into cold front, warm front and quasi-static front.

Typical cold front weather in China: summer rainstorm in the north; Strong winds, sandstorms and cold waves in winter and spring; Autumn rain, colds, etc.