The weather condition of 1, 2, 3 and 4 in the figure is a 1 blowing northwest wind.

A, according to the numerical distribution of isobar, it can be judged that the pressure value of E is the lowest and that of D is the highest, which does not meet the meaning of the question;

B. According to the frontal system in Figure 2, it can be judged that there is rainy weather before the warm front and after the cold front. A, C and D are controlled by cold air mass, while B and E are controlled by single warm air mass. B the latitude is relatively low and the temperature is high, which does not meet the question.

C, the size of the wind depends on the density of the isobar, the denser the isobar, the greater the wind, and the maximum wind speed in B, so it is correct;

D. specifically, the wind direction is from high pressure to low pressure, the northern hemisphere deflects to the right, and the geostatic wind direction is southeast wind, which does not meet the meaning of the question.

So choose: C.