August 14, 2002: Convective and Stratiform Precipitation with BS around KOUN Author: Pam Heinselman, CIMMS/OU Last Updated: 18 April 2003

Forecast/Weather:

On 14 September, areas of convective and stratiform precipitation move from central into southeastern Oklahoma, this storm movement and the following cessation of precipitation, corresponds with the movement of the shortwave trough across Oklahoma (Figs. 1-10). Polarimetric variables show a possible hail signature 00:01 UTC in an area south-southeast of KOUN, where RhoHV is 0.93, ZDR is low, and KDP is low (see Figs. 2-5). Biological scatterering from insects is prevalent around KOUN between 7:03-13:08 UTC, as the precipitation moves toward southeastern Oklahoma (Figs. 6-10). Also notice a bright band signature in southeastern Oklahoma (Figs. 6-9).

Radar Operations:

Start time: 00:01 8/14/02 UTC (19:01 8/13/02 local time)
Stop time: 04:10 8/14/02 UTC (23:10 8/13/02 local time)

Start time: 07:03 8/14/02 UTC (02:03 8/14/02 local time)
Stop time: 13:08 8/14/02 UTC (08:08 8/14/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: Radar reflectivity at 00:01 UTC 14 August 2002.	Figure 2: Differential reflectivity at 00:01 UTC 14 August 2002.
Figure 3: Correlation coefficient at 00:01 UTC 14 August 2002.	Figure 4: Specific differential phase at 00:01 UTC 14 August 2002.
Figure 5: Hydrometeor classification algorithm output at 00:01 UTC 14 August 2002.

Figure 6: Radar reflectivity at 07:03 UTC 14 August 2002.	Figure 7: Differential reflectivity at 07:03 UTC 14 August 2002.
Figure 8: Correlation coefficient at 07:03 UTC 14 August 2002.	Figure 9: Specific differential phase at 07:03 UTC 14 August 2002.
Figure 10: Hydrometeor classification algorithm output at 07:03 UTC 14 August 2002.