Abstract
Severe convective clouds developed in the Tokyo Metropolitan Area in the afternoon of 12 July 2008, and the storm produced F0 downbursts. Two X-band multi-parameter radars operated by the National Research Institute for Earth Science and Disaster Prevention (NIED) captured the structure of the wind and hydrometeors within the cloud, as well as their time evolutions. The storm had a multi-cellular appearance, and the radars captured the development of four separate cells. The existence of wet hail aloft within the updrafts is suggested from the high rainfall rate estimated from reflectivity compared with that from the specific differential phase.
