2019 年 75 巻 2 号 p. I_127-I_132
Rapid Development Cumulus Area (RDCA) indicates the developing process of cumulus clouds that are potentially expected to evolve into thunderstorm within one hour in around 10 km2 area. To express cloud developing process, Rapid Scan Observation (RSO) of Himawari-8 data is used to generate RDCA index ranging from 0.1 to 0.9 by adapting logistic regression model. As the RDCA index represents cloud development without information of updraft, we try to prove RDCA index can reflect updraft information by comparing RDCA index time series with parameter of differential reflectivity (ZDR) and vertical wind velocity estimation obtained by multi Doppler analysis. As a result, based on three cases, we found all of them have a good temporal correlation between RDCA index time series and ZDR, and only one case has a good temporal correlation between RDCA index and vertical wind velocity estimation.
