Some Characteristic Features of the Heavy Rainfalls Observed over the Western Japan on July 9, 1967

[摘要] Remarkable mesoscale disturbances are observed in association with the heavy rainfalls which took place along the western part of the Japan Islands on July 9, 1967. The wave length of 100-200km, the amount of divergence of the order of 10-4 sec-1 and other features are very much similar to those which characterize disturbances in case of heavy snowfall.The large amount of precipitation seems to be fed from immediate neighbourhood of predominant divergence. The rainfall area and intensity of individual cells show a phenomenon of pulsation with a period of about 3 hours, which is reflected upon the short period fluctuation of large scale precipitation.Quantitative discussion is made on the surface wind divergence and vorticity field.

[学科分类] 大气科学