Thunderstorm Activity and Typhoon in Western Japan

Abstract

When a typhoon appears over sea to South of Ryukyu Islands, the change in the thunderstorm activity in Western Japan occurs. In this paper the present author studied the relationship between the thunderstorm activity in Kyusyu and typhoons which attacked Kyusyu or its neighbourhood during the period June-September in 1935-1938.
The paths of the typhoons studied are shown in Fig 1. The results are:-
1) When the typhoon enters into the China Eastern Sea, thunderstorm occurs in some part of Kyusyu.
2) No thunderstorm occurs when the typhoon moves to NE-ward in the sea to East of Ryukyu Islands.
3) When the typhoon moves through Kyusyu, thunderstorm occurs in front of the typhoon a few days before.
Severe thunderstorm was experienced in the east quadrant of the typhoon, July 25 1937. This thunderstorm advanced to northward as the centre of the typhoon moved to the North and is considered as the warm front type.