Geography education

Geography education | cold and warm front

Illustration:

Type: cold front, warm front

Definition:

① Cold front: The front formed by the active movement of cold air mass to warm air mass is called cold front.

② Warm front: A warm front refers to a front where warm air pushes the front to move to one side of the cold air mass when the front moves.

Form:

1. cold front

(1) Before crossing the border

Before the cold front crosses the border: the temperature is high, the weather is clear and the air pressure is low, which is controlled by a single heating substance.

When crossing the border: strong wind, cooling, rainy (precipitation is concentrated behind the front, but also before the front)

(2) When crossing the border, the following situations will occur: the air pressure before the front drops sharply and the air pressure after the front rises; The temperature drops; Gradient increase; Atmospheric pressure increases obliquely; The wind direction changes clockwise; There is precipitation, even thunderstorms. (Generally, this situation only occurs in mid-latitude areas, and it is also possible in low-latitude areas in late spring and early summer, because the cold front at that time generally develops at the latitude of 25-30, while the temperature in low-latitude areas is generally high, and lightning is prone to occur in the case of high-temperature friction. )

(3) After transit:

Temperature: drop, controlled by cold air mass.

Air pressure: decrease first and then increase.

Precipitation: It will rain when the front is out of date.

Weather: It's sunny.

2. Warm front

(1) Before crossing the border: the temperature is low, the weather is fine, and the high pressure is controlled by a single cold air mass.

(2) Continuous precipitation during transit (precipitation is mainly concentrated in front of the front)

(3) After the warm front:

Temperature: rise, controlled by heating substance.

Air pressure: drop

Weather: cloudy

Verb (abbreviation of verb) abstract