Localized torrential rainfall in urban area and its relationship with the occurrence of heat islands and thermal lows

A case study in July 24, 2015

Abstract

We made an attempt at clarifying the relationship between thermal lows and localized torrential rainfalls in Tokyo Metropolitan Area based on the high-density temperature and air pressure observation system which we developed since 2006.  A case study on the localized torrential rainfall on 24 July 2015 indicated that lowering and increasing trend of air pressures around heavy rainfall area occurred, where high temperatures and moist air penetration from sea-breeze were observed.