Analysis of Heavy Rainfall with Hail using Reflectivity and Radial Velocity Derived from X-Band Radar in Bandung (Study Case: March 17, 2017)

A local heavy rainfall along with hail and strong wind occurred in Bandung basin on March 17th, 2017. This event was documented using an X-band Doppler radar and supported by rain scanner, and C-band radar. Based on three types of radar, it was concluded that this was a local heavy rainfall, started at 10.50 LT. The location of the first reflectivity was detected from 25 km northward (107.6°W, 6.92°S) of X-band Doppler radar location. Reflectivity pattern showed a V-shaped with duration of about 30 minutes and reached its peak at about 11.30 local time (LT). Maximum horizontal wind speeds from Automatic Weather Station (AWS) took place during those periods. Based on vertically integrated liquid (VIL), the potential of hail was located at the right flank of the V-shaped. Three vertical cores with maximum reflectivity were also looked at in the right flank at altitude of 2-6 km with echo top reached up to 9 km above ground surface.