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In order to investigate the effect of the factors in tower latitudes on Meiyu/Baiu front,adiagnostic analysis for the two cases during June to July of 1985 and 1986 was examined.We foundthat (1)when the tropical convective activity moves westward to 10.5-15.5′N/140°E from eastside of 10.5-15.5°N/160°E,the northward shifts of the Meiyu/Baiu rain belt occurs;(2)themain factor which results in the northward and southward shifts of Meiyu/Baiu rain belt is thoughtas the 8,18 and 30 day oscillations of the tropical convective activity around West Pacific.Meanwhile,the wave train propagating from Lake Baikal via Okhotsk Sea to the tropics couldsometimes shift Baiu rain belt southward;(3)the onsets of Meiyu in China of both cases tend totake place just when the convective activity around lower latitudes moves westward through about140°E with the 8,18 and 30 day oscillation periods firstly coming to June.
In order to investigate the effect of the factors in tower latitudes on Meiyu / Baiu front, adiagnostic analysis for the two cases during June to July of 1985 and 1986 was examined. We found that (1) when the tropical convective activity moves westward to 10.5- 15.5’N / 140 ° E from eastside of 10.5-15.5 ° N / 160 ° E, the northward shifts of the Meiyu / Baiu rain belt occurs; (2) the main factor which results in the northward and southward shifts of Meiyu / Baiu rain belt is thoughtas the 8,18 and 30 day oscillations of the tropical convective activity around West Pacific .Meanwhile, the wave train propagating from Lake Baikal via Okhotsk Sea to the tropics could shift the Baiu rain belt southward; (3) the onsets of Meiyu in China of both cases tend totake place just when the convective activity around lower latitudes moves westward through about140 ° E with the 8,18 and 30 days old sessions coming coming June.