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  中(zhōng )央气象(xiàng )台(tái )首(shǒu )席预报员 方(fāng )翀:在(zài )春(chūn )季(jì )就是说(shuō )出现这种忽冷忽热的天气(qì )现象(xiàng )的话,应该(gāi )来说还是比较(jiào )常见(jiàn )的。在冬(dōng )天(tiān )的话,我(wǒ )国大(dà )部地区都是受到(dào )这(zhè )种冷高压(yā ),或者说这种(zhǒng )冷气团的这么一个控(kòng )制或(huò )者影(yǐng )响,暖气(qì )团相对来说势力比较弱小(xiǎo ),这样的(de )话冷(lěng )暖气(qì )流交汇(huì )并(bìng )不(bú )是很(hěn )强(qiáng ),相(xiàng )对来说(shuō )气温幅度变化(huà )并不是太(tài )大。春季(jì )正处(chù )于这么(me )一个(gè )冷(lěng )气(qì )团(tuán )和(hé )暖气团此消彼(bǐ )长的季(jì )节。当冷气团(tuán )势力积(jī )聚到(dào )一定程(chéng )度(dù ),并且大(dà )举南下的时候,这个气温就会(huì )大幅度下降。但是当它势力衰(shuāi )弱(ruò ),而(ér )暖气团开(kāi )始加(jiā )强(qiáng )的时(shí )候,气温又会大(dà )幅(fú )度上(shàng )升,所以就出(chū )现了这种(zhǒng )忽(hū )冷忽(hū )热的现象。

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