Analyze the schematic diagram of a weather system and answer the following questions: (* * 1 2) (1) Judge the weather in C: ...

(4) At this time, the temperature in the second place is high, the air pressure is low, and the weather is fine; When the cold front crosses the border, B will be cloudy, windy, rainy, cool and even snowy; After the cold front crossed the border, the temperature dropped, the air pressure rose and the weather turned fine.

Test and analysis: (1) From the isobar distribution in the figure, C is the center of high pressure, and downflow prevails, so the weather is fine. (2) According to the distribution of cold and warm fronts on both sides of frontal cyclone, the weather system is located in the northern hemisphere, and the wind direction can be drawn directly according to the distribution of isobars on the map: oblique isobars point from high pressure to low pressure, and the northern hemisphere inclines to the right. (3) Combined with the front distribution in the figure, precipitation always appears on the side of the cold air mass, so it is judged that the rain area is located at A and D. (4) The teaching material can be used to describe the weather conditions before, during and after the cold front passes through.

Comments: This question is generally difficult. As long as students can master the pressure distribution characteristics of the map, they can use the weather change process map before and after the northern hemisphere frontal cyclone and cold front transit to judge, and the analysis can be more intuitive.