The concept of common weather system

The interface between cold and warm air masses is called front.

There are obvious differences in temperature, humidity, air pressure and wind force on both sides of the front.

(1) What is the highest temperature in A, B and C? Maximum air pressure?

What is the biggest change in the weather?

Fronts are often accompanied by clouds, rain and strong winds.

Cold front and weather

(1) concept:

The front where the cold air mass actively moves towards the warm air mass.

(2) Weather:

When crossing the border: cloudy, rainy, windy, cooling and other weather phenomena often occur.

After crossing the border: the air pressure rises, the temperature and humidity drop sharply, and the weather is fine.

(3) Graphics: (4) Impact on China: A. Summer rainstorm in northern China

B, sandstorm weather in winter and spring in northern China

C, the cold wave that broke out in winter in China

Second, warm front and weather.

⑴ Concept: The front where the warm air mass moves to the cold air mass.

When crossing the border:

⑵ Weather: Clouds gradually thicken, forming continuous precipitation, which occurs after the front crossing: the temperature rises, the air pressure drops, and the weather turns fine.

(3) graphics:

(4) Impact on China.

Local precipitation in southern China

Two, low pressure (cyclone) and high pressure (anticyclone) system

Low pressure or cyclone, high pressure or anticyclone are different descriptions of the same weather system.

Low pressure and high pressure describe the atmospheric pressure of weather system.

Cyclone and anticyclone are descriptions of airflow in weather system.

Cyclone separator (low pressure)

Central air pressure: low pressure

Horizontal airflow: counterclockwise convergence

Vertical motion of central airflow: rising

Weather conditions: the south wind blows in the east and the north wind blows in the west.

The second anticyclone (high pressure)

Central air pressure: high pressure

Horizontal airflow: diverging clockwise

Vertical motion of central airflow: rising

Weather conditions: sunny

Three-front cyclone

Surface cyclones are usually associated with fronts.

Frontal cyclone is a common weather system in middle and high latitudes in China.