Read the "weather system map of a place in the northern hemisphere" and answer the following questions. (1) From the airflow movement of C and D in the figure, C is _ _ _ _ _ _; D depression

(1) According to the distribution and numerical value of isobar in the figure, it is not difficult to judge that C is a high pressure center (anticyclone), and the central airflow sinks, which often leads to sunny weather. D is a low-pressure center (cyclone), and its central airflow rises, which often leads to rainy weather. On cloudy days, the solar radiation is weak, the temperature is low, and the atmospheric reverse radiation has a good heat preservation effect at night, so the temperature range on cloudy days is small.

(2) Combined with isobars, we can draw and analyze the isobars with oblique wind direction, from high pressure to low pressure, and the geostrophic force in the northern hemisphere shifts to the right. A is the west wind (or northwest wind), and B is the south wind (or northwest wind). The isobar at A is denser than that at B, so the wind at A is stronger.

(3) According to the time and weather changes, it can be judged that the weather system affecting Harbin on that day is cold front weather. Combined with the representation of graphic front and the keyword "after snow", it can be judged that Harbin should be behind the cold front at this time. After the cold front crossed the border, the temperature dropped, the air pressure rose and the weather turned fine.

So the answer is:

(1) anticyclone rising CD

(2) The west wind (or northwest wind) turns to the south wind (or northwest wind) a.

(3) cold front? Answer? The temperature drops, the air pressure rises, and the weather turns fine.