Heavy Rainfall around the Suzuka Mountains (2) -Synoptic Study-

Abstract

Typical examples of the heavy rainfall around the Suzuka mountains being shown, the characteristics of precipitation distribution, the synoptic situation and the condition of upper air in these cases are analysed and the relations among them are investigated. Necessary conditions for the occurrence of this heavy rainfall are strong southeasterly or southwesterly wind and high humidity in the lower troposphere. The synoptic situation in the cases of heavy rainfall is that in which typhoon or cyclone generates such conditions. The typical orographic heavy rainfall with nearly neutral stability is supposed usually to have a characteristic wherein rain falls-less, intensely and continues longer, rather than in the case of convective rainfall. In the case of heavy rainfall with a convectively unstable state and low level strong southwesterly wind, such as the heavy rainfall in the last period of Baiu, it seems to be difficult to predict the area of heavy rainfall.