Air fronts
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Air fronts

Air fronts. Atmospheric fronts

Air Front - a narrow sloping transition zone between air masses having different physical properties (temperature, humidity, and so on. D.).

Depending on whether the air mass after another: warm cold or cold warm fronts are divided into two main types: warm and cold.

Warm Front is called the front, moving in the direction of the cold air mass. Such a front brings warming.

A cold front is called the front, which moves in the direction of the warm air mass. Such a front brings cooling.

In the practice of cold fronts can be subdivided into two kinds:

  • cold front of the first kind;
  • cold front of the second kind.

Air fronts 2

Cold front of the first kind - A slow-moving or significantly slows down the front, over the entire surface of which there is an upward movement of warm air.

Cold front of the second kind - A fast-moving or significantly accelerating its movement up front, along the top surface of which there is a downward movement of warm air, and in the lower part of the front surface (within the lower 1,5-2 km) there is an upward movement of warm air caused by a steep profile fast moving frontal surface .

The secondary fronts are called partitions between different parts of one and the same air mass. They occur mainly in the cold air mass and separating the first "batch" several progrevshegosya air from following a cold "portion." These fronts are found mostly in the lower atmosphere and rapidly eroded.

Air fronts 4

Stationary (immobile) fronts are called sections of the main front, does not undergo any significant movement on the term to term.

In the troposphere there are also so-called complex fronts, or occlusal fronts, which are formed when the cold and warm fronts are closed. The front of occlusion is called by the type of warm - warm front of occlusion; Occurs when the cold air mass behind the cold front is warmer than before the warm front, and, pushing warm air up, simultaneously flows into the front, colder mass. By the type of cold front there is a cold front of occlusion, when the air mass behind the cold front is colder than the air mass in front of the warm front and the rear mass leaks both under warm and under cold air mass.

In the atmosphere, there are cases where the surface of the front does not reach the ground.

Such fronts are called the upper.

Aeronautical meteorology

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