Abstract
Recently the Tokyo urbanized area becomes more vulnerable to thunderstorm-like heavy rain rather than the rain acompanied with typhoon (Tamashima et al.1990). Hence in the present study an attempt has been made to analyze the characteristics of the generation and evolutional process of cloud cells in the Tokyo metropolitan area by using of a 3D radar system. The results of the analyses for typical three cases of 31 July 1987, 13 August 1988, and 17 August 1988 suggest that in addition to the heat island effect due to the urbanized area, the existence of Tokyo Bay as a cool island and a source of water vapor also affects the evolutional process of cloud cells.
