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  中(zhōng )央(yāng )气象台首席预报员 方翀:在(zài )春季(jì )就(jiù )是说(shuō )出现这(zhè )种忽冷忽热的天气现象(xiàng )的话,应(yīng )该来说还是比(bǐ )较常见(jiàn )的。在冬天的话,我(wǒ )国大(dà )部(bù )地(dì )区都是受到这种(zhǒng )冷高压,或者说(shuō )这种冷气团的(de )这么一(yī )个控(kòng )制或者(zhě )影(yǐng )响(xiǎng ),暖气团相(xiàng )对来(lái )说势(shì )力比(bǐ )较弱小,这样的(de )话冷暖气流交汇并(bìng )不是很(hěn )强,相(xiàng )对来(lái )说(shuō )气温(wēn )幅度变(biàn )化(huà )并(bìng )不(bú )是太大(dà )。春季正处于(yú )这么一个冷气(qì )团和暖(nuǎn )气团此(cǐ )消彼(bǐ )长(zhǎng )的季节。当(dāng )冷(lěng )气团势力(lì )积聚(jù )到(dào )一定程度,并且(qiě )大(dà )举南下的时(shí )候,这(zhè )个气温就会(huì )大幅度(dù )下降(jiàng )。但(dàn )是当它势力衰(shuāi )弱,而暖气团(tuán )开(kāi )始(shǐ )加(jiā )强的时(shí )候,气温(wēn )又会大(dà )幅度上(shàng )升,所以就出(chū )现了这种忽冷忽(hū )热的现象。

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