Daily air pressure

(1) high, anticyclone, sinking, sunny.

(2) It's cold, the weather turns fine, the temperature drops and the air pressure rises. B

(3) (2) When the isobars are dens

(1) high, anticyclone, sinking, sunny.

(2) It's cold, the weather turns fine, the temperature drops and the air pressure rises. B

(3) (2) When the isobars are dense and the horizontal pressure gradient force is large, the northwest wind and the north wind are strong.

Test analysis:

(1) This topic studies common weather systems. Cyclone and anticyclone describe the airflow condition of weather system, while low pressure and high pressure describe the pressure condition of weather system. In fact, cyclone is a low-pressure system and anticyclone is a high-pressure system. The air pressure in the central area of A is high, so it is a high pressure (anticyclone) system. The central air current sinks, what a sunny day.

(2) This question examines the frontal system and weather. The symbol of the middle plane in the picture is cold front weather. After the cold front crossed the border, the weather turned fine, the temperature dropped and the air pressure rose. Cold front weather is active for cold air masses, so choose B.

(3) This question examines the influencing factors of wind speed. On the isobar diagram, the wind speed mainly depends on the density of isobar, with high density, large horizontal pressure gradient and high wind speed; ② the density of isobar is high and the wind speed is high. The wind direction is combined by horizontal pressure gradient force and geostrophic deflection force, and the geostrophic deflection force in the northern hemisphere turns to the right and finally to the northwest wind.

Comments:

Cold Front, Warm Front and Weather

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cold front

warm front

Quasi-static front and weather

chart

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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

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