Study on Meteorological Conditions Preceding the Appearance of a Cumulonimbus Cloud Causing Suddenly a Heavy Rainfall on a Basin in Summer

2016 Fiscal Year Final Research Report

• Project/Area Number: 26750134
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: National Institute of Information and Communications Technology (2016); University of Yamanashi (2014-2015)
• Principal Investigator: SANO Tetsuya 国立研究開発法人情報通信研究機構, 電磁波研究所リモートセンシング研究室, 研究員 (90533589)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 積乱雲 / 局地的降雨 / 局地風 / 水蒸気輸送 / 甲府盆地

Outline of Final Research Achievements

To elucidate the formation process of a sudden heavy rainfall in a local region on a basin in summer, we analyzed the meteorological conditions on a Basin preceding the appearance of a cumulonimbus cloud (a precipitating cell) using the 23 cases that a cumulonimbus cloud appeared and developed on the Kofu Basin in summer from 2012 to 2014. From the analyses of the cases, we consider the atmospheric instability on the Kofu Basin which was caused by the moisture transport associated with the local winds to the Kofu Basin from the outside at surface and the moisture advection above the Kofu Basin from the surrounding mountains to the Kofu Basin, and the lifting of moisture at the horizontal convergence formed by the local winds at surface causing a cloud. Thus, it is suggested that cumulonimbus clouds appeared and organized on the region of the horizontal convergence, which contributed to the formation of a rainfall in a local region on the Kofu Basin.

Free Research Field

気象学