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冬天,江南地区受寒潮侵袭后,往往大冷三天左右,天气就回暖了。这是什么原因呢?原来,南下的冷空气往往形成一个气压比周围要高的闭合的高气压中心,它的前部盛行着偏北气流,而它的后部盛行偏南气流;这个高气压越强,为它开路的寒潮也越强。从寒潮开始暴发南下,到影响江南地区,一般要两天
In winter, after the cold wave in the south of the Yangtze River, it was often cold for about three days and the weather was warmer. What is the reason for this? It turns out that the cold air to the south often forms a closed high air pressure center that has a higher air pressure than the surrounding area. It has a northerly air flow in the front and a southerly air flow in the rear; this high air pressure prevails. The stronger it is, the stronger the cold wave that opens it. From the outbreak of the cold wave to the south, to the impact of the southern region, it usually takes two days.