Read the figure below "Map of local ground weather situation in China at 23: 00 on March 6, 20 13 (unit: hectopascals)" and answer the following questions. (1) Figure A is affected by _ _ _

(2) According to the force analysis of wind, the horizontal pressure gradient force points to the center of low pressure, and under the action of geostrophic deflection force, the wind direction in the northern hemisphere leans to the right, so it can be judged that it is southerly wind blowing in Harbin at this time. Looking at the map, we can see that compared with Hangzhou, Harbin has dense isobars and large horizontal pressure gradient, so the wind is strong.

(3) According to the sign of the front, it can be judged that the weather system A is a cold front, which moves to the southeast under the push of cold air. When the cold front crosses the border, there will be strong winds, cooling, clouds and rain.

(4) According to the conditions given in the title, it is March 16, it is spring, and there is a spring drought in North China. This precipitation can alleviate the spring drought, and of course, the precipitation weather also affects travel.

So the answer is: (1) high? very good

(2) southerly wind? Large density and large density

(3) cold front? Moving southeast? Clouds increase, the temperature drops, accompanied by precipitation (gale) (4)

Precipitation relieves spring drought (precipitation affects travel)