著者

合田 泰弘 加藤 内藏進 塚本 修

出版者

岡山大学理学部地球科学教室

雑誌

Okayama University Earth Science Report (ISSN:13407414)

巻号頁・発行日

vol.19, no.1, pp.39-50, 2012-12-26

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A case study on persistent appearance of the ensemble of precipitation bands in the warm sector of the Baiu front inKyushu District, the western part of Japan around 19 June 2001 was performed based on the operational observationaldata. Around 00UTC (09JST) 19 June when the Baiu front on the surface weather map was still located about a few100kms to the north of Kyushu, the number and the total area of the meso-β or γ-scale line-shaped precipitationbands increased around Kyushu rapidly. These precipitation bands had been sustained there and gradually gatheredeach other to change into the Baiu frontal precipitation zone extending from the northern Kyushu to Seto-Naikai (SetoInland Sea) around 09UTC (18JST) 19 June (the intense rainfall zone was still located in the warm sector of the Baiufront).Until ~09UTC (18JST) 19 June, the moist air flow with the latently unstable stratification had been sustainedaround Kyushu corresponding to the low-level southerly wind toward the surface Baiu front to the north of Kyushu.This large-scale situation would contribute greatly to the maintenance of the ensemble of the line-shaped precipitationbands in the warm sector of the Baiu front.