Read the weather in a certain area of the northern hemisphere.

(1) low; Cold air mass; Warm air mass.

(2) South; Big;

(3) a and D.

Test analysis:

(1) Cyclone and anticycl

Read the weather in a certain area of the northern hemisphere.

(1) low; Cold air mass; Warm air mass.

(2) South; Big;

(3) a and D.

Test analysis:

(1) Cyclone and anticyclone describe the airflow condition of weather system, while low pressure and high pressure describe the pressure condition of weather system. Judging from the air pressure, the air pressure value at point A is lower than that at point B. Judging from the nature of air mass, A is a cold air mass and B is a warm air mass.

(2) This question examines the formation of wind. The horizontal movement of the atmosphere is called wind, and the direct cause of wind is the horizontal pressure gradient force, which is perpendicular to the isobar and points to the low pressure. At high altitude, the wind direction is only affected by the horizontal pressure gradient force and geostrophic deflection force, while near the ground, the wind direction is also affected by friction. B is south; The wind power depends on the density of isobars, which are dense, the horizontal pressure gradient force is large and the wind speed is high, so the wind power at A is greater than that at B.

(3) This question examines the frontal system and weather. If cold and warm fronts can cause precipitation, the cold front precipitation is located behind the front and the warm front precipitation is located before the front, then the rain area is around A and D..

Comments: Cold Front, Warm Front and Weather

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cold front

warm front

Quasi-static front and weather

chart

?

sign

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concept

The cold air mass actively moves to the warm air mass.

The warm air mass actively moves to the cold air mass.

Quasi-static front refers to a front with a small moving range.

Weather characteristics

Before crossing the border

Single air mass control, sunny day

Single air mass control, low temperature and sunny days

The cold and warm air masses are evenly matched, or blocked by the terrain, the front moves slowly, or swings in an area for a long time, resulting in rainy weather.

transit time

Cloudy day, rain and snow, strong wind, cooling down

Continuous precipitation

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