Abstract
The author picked up 21 case of newly born cyclones in Japan Sea from the end of 1920 to June 1923. They appear mostly in the winter months i.e. Month Oct. Nov. Dec. Jan. Feb. march April June Frequency 1 2 3 4 5 2 1 2 of these cyclones 5 classes may be distinguished with respect to their birth places. He examined the condition prevailing before or at the time of the birth of the cyclones and noticed that a characteristic sudden rises and falls of temperature were always seen. Thus he insists that the cyclones may be the products on the lines of iscontinuity, developing from the horizontal vorticity effected by the orographic conditions as S. Fujiwhara has already has already suggested. The author recommends the hourly observations in order to issue timely warning against the sudden break out of the cyclone of the kind. (S. F.)
