The Distribution of Frequency of Rainy or Cloudy Weather in the Southern Part of Tohoku District under the “Yamase” Cold Wind

Abstract

During the “Bai-u” season, cold and humid easterly wind called “Yamase” often prevails over Northeastern Japan. The distribution of frequency of non-fine weather (Fig. 1) or rainy weather (Fig. 2) under such a condition was obtained. Fig. 1 shows that the area of rainy or cloudy weather extending from the east is limitted by the higher part (>1000m) in Ou backborne range, and Fig. 2 shows that rainy weather often appears on the windward slope of the mountain ranges (Ou, Kitakami and Abukuma).