The description of the weather changes in the illustrated area may be: a cloudy to sunny days in the Loess Plateau, b southerly winds in the Yangtze River Delta increase.

According to the figure, it can be seen that the center of low pressure is in the Asian continent and the center of high pressure is at sea, so it is likely to be in summer at this time.

And the ridge of high pressure is obviously in the south of the Yangtze River. At this time, the Yangtze River should be controlled by rain belts, and the contour lines become dense, so the southerly wind will increase; However, the pressure on the Loess Plateau has not changed much, and it is controlled by the trough of low pressure, so the weather should not clear up.