Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
Local Heavy Rainfall in the Vicinity of Tsu City Accompanied the Typhoon 5907
R. Sasaki
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1963 Volume 41 Issue 6 Pages 337-347

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Abstract

Two remarkable groups of precipitation were observed as the typhoon 5907 advanced northward through the central part of Japan. One of these groups was observed in the vicinity of Tsu city west of the typhoon path, showing a heavy rainfall amounting to 95.3mm hr-1. The other group brought about one-third hourly precipitation of the former on the mountainous areas in front of the typhoon. The mechanism of these rainfalls is analyzed using isobaric and isentropic charts, with the following results:
(1) These rainfalls are qualitatively explainable by use of isentropic analysis, though the observed precipitation does not coincide with a computed one based on the large scale analysis.
(2) From the observed value of the former precipitation, a small scale disturbance is presumed, which took birth on the westside of the typhoon trajectory owing to an interaction of westerly currents and the typhoon, and the horizontal scale of the disturbance is estimated to be about 50 km. In other words, this is inferred to be a meso-scale disturbance possessing an ascending velocity of 2m sec-1, or an isentropic slope of 1/20.

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