2004年10月後半の台風23号に伴う日本列島での広域の降水（台風18号と比較して） [in Japanese] A case study on the rainfall distribution over the Japan Islands associated with the approach of Ty0423 in late October (Comparison with that for Ty0418) [in Japanese]
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Rainfall distribution in the Japan Islands associated with the approach of Typhoon No.23 around 20 October2004 (referred to Ty0423, hereafter) showed considerably different features from those in late summer of thisyear. The present study examined the detailed rainfall features around the Japan Islands brought by Ty0423and the atmospheric processes based on the operational observation data by the Japan Meteorological Agency(JMA), comparing with those in association with Ty0418 around 7 September 2004.During the stage when Ty0423 was approaching or landing on the western part of the Japan Islands, theareal mean precipitation from Kyushu to Kanto District attained much larger than that for Ty0418, with widerextension of the area with the large amount of precipitation. It is interesting that, although the intense rainfallwas observed only at the upstream side of the mountain range from Kyushu to Honshu District for Ty0418except for the area near its center, strong rainfall with 10~30 mm/h persisted in wider regions from the westernto the eastern part of the Japan Islands, resulting in the considerably large total rainfall for Ty0423.As for the case for Ty0423, the surface front with stable frontal surface was located just to the east of theTy0423 center just before its landing at the Japan Islands. Thus, the huge moisture inflow mainly in the easternregion from the typhoon center seems to be redistributed widely over the Japan Islands area associated withthe large-scale convergence around the stable frontal surface. In late October, the colder air associated withthe high pressure system in the eastern Siberia can cover the northern part of the Japan Sea area as the seasonalmarch. Such basic field might be favorable for sustaining the synoptic-scale front just around the southerncoast of the Japan Islands, even when the strong southerly wind invades associated with the typhoon approachthere.
- Okayama University Earth Science Report
Okayama University Earth Science Report 20(1), 13-24, 2013-12-27