On 27 February, the S-Pol radar sampled several periods of convective activity over the location of the University of Iowa Two-Dimensional Video Disdrometer (2DVD) at the TOGA radar site using a customized "rapid update" scanning strategy (click here for information on the radar scans strategies that were implemented during LBA) The scanning strategy consisted of relatively narrow sectors over the 2DVD site at alternating elevation angles (0.7 and 1.2 deg) in a 12-tilt sequence. This allowed for a sample to be collected over the 2DVD site approximately every 17 seconds while the rapid update scan was run. The purpose of this scan strategy was to provide high resolution polarimetric measurements that could be compared to corresponding drop size distribution measurements from the UIowa 2DVD.
On 990227, several monsoonal MCSs developed and moved across the radar field of view (generally west to east). These systems were characterized by aerially extensive rainfall but appeared to be rather poorly organized. Rainfall was recorded at the TOGA radar site between 0722-1711 UTC. The S-pol rapid update scan strategy was implemented between 0722-0728 UTC and 1500-1637 UTC. Herein, we analyze data from the 1500-1637 UTC time period (note that useful data for comparison was restricted to ~1500 to 1540 UTC) associated with convection along the southern fringe of an MCS that moved across the radar domain during the afternoon hours. This comparison is used for cross-validation of the instrument platforms. This work is a joint project between the Iowa Institute of Hydraulic Research at University of Iowa and the CSU Radar Meteorology Group.