What are the characteristics of weather phenomena caused by cold front, warm front, quasi-static front and occluded front?

is a narrow and inclined transition zone between cold and warm air masses. Because there are considerable differences in temperature front and humidity between different air masses, and this difference can be extended to the whole troposphere, when two air masses with different properties meet in the process of moving, there will be an interface between them, which is called front. The line formed by the intersection of front and ground is called front. Generally, front and front are collectively referred to as front. It can also be understood as a confrontation between two air masses with different properties. Because of the great differences in the properties of the air masses on both sides of the front, the air movement near the front is active, and there is strong ups and downs in the front, and the airflow is extremely unstable, which often causes severe weather changes. Therefore, the front is one of the important weather systems.

According to the thermodynamic classification method, if the cold air masses actively promote the warm air masses, it is called a cold front. On the contrary, it is called a warm front. If the cold and warm air masses are equivalent, It is called quasi-static front. If the cold front catches up with the warm front, it will form an occluded front.

Cold front

During the movement of the front, the cold air mass plays a leading role, pushing the front to move to the side of the warm air mass, and this front becomes a cold front. The cold front is the cold air front that everyone often mentions. It is the vanguard of the cold air going south and the most common weather system affecting China. This is especially true in the winter half year. In winter, a cold air invades the inland from the northwest and north China of China every few days. When the cold front crosses the border, it will be accompanied by the increase of northerly wind, the increase of air pressure and the decrease of temperature, sometimes causing rain and snow, and even heavy rain in summer. Generally, after the cold front crosses the border, the local area will be controlled by cold high pressure, and the weather will become clear.

Warm front

Warm front means that the front is moving. Warm air pushes the front to move to one side of the cold air mass. After the warm front crosses the border, the warm air mass occupies the original position of the cold air mass. The warm front mostly moves in the northeast of China and the middle and lower reaches of the Yangtze River, and is mostly connected with the cold front. When the warm front crosses the border, it is warm and humid, the temperature rises, the air pressure drops, and the weather turns cloudy and rainy. In contrast to the cold front, the warm front moves slower than the cold front. There may be continuous precipitation or fog.

Static front

When the cold air mass from the north and the warm air mass from the south are evenly matched and have the same intensity, their collision area rarely moves. This front is called a static front. Often, when the cold air mass is slightly stronger, it moves to the south, and when the warm air mass is strong, it pushes to the north, which makes the front swing from north to south, which is also called a quasi-static front, which affects the city's static front.