What does the front line mean?

The line where the front intersects the ground is called the front. Front is a meteorological term that refers to the intersection of cold and warm air. When cold and warm air masses meet, there will be an inclined interface between them, which is called front (front area); Fronts and fronts are generally called fronts. According to the moving direction and structure of cold and warm air masses on both sides of the front, the front is generally divided into four types: cold front, warm front, quasi-static front and blocking front.

The length of front is equivalent to the horizontal scale of air mass, which can reach hundreds to thousands of kilometers; Its vertical extension height can reach the tropopause, and part of it is limited to the lower troposphere (below 1.5km). The meteorological elements and weather on both sides of the front change dramatically, which is an extremely important common weather system.

According to the moving direction and structure of cold and warm air masses on both sides of the front, the front is generally divided into four types: cold front, warm front, quasi-static front and blocking front. A cold front is a front that a cold air mass pushes the front surface to move to one side of a warm air mass.

Due to different moving speeds, cold fronts can be divided into (slow) cold fronts and (fast) cold fronts. The warm front is the front that the warm air mass pushes the front surface to move to the side of the cold air mass. Quasi-static front refers to the front where the cold air mass and the warm air mass are equal in strength, or sometimes the cold air mass is dominant, sometimes the warm air mass is dominant, and the front rarely moves or swings back and forth.

Blocking front is the front formed when the cold front catches up with the warm front. The warm air between the two fronts is lifted off the ground and trapped at high altitude, and the cold air mass behind the cold front contacts with the cold air mass in front of the warm front.