April 19, 2003: Morning Squall Line w/ Afternoon Convective Cells and Dry Line Author: Pam Heinselman, CIMMS/OU Last Updated: 29 April 2003

Forecast/Weather:

On 19 April 2003, a squall line moved across Oklahoma during the morning (06-14 UTC). During the afternoon, convective cells formed over north-northwestern Oklahoma (19:28-21:59 UTC) and east of KOUN, ahead of the dry line (20:34-21:59).

Radar Operations:

Start time: 00:03 4/19/03 UTC (19:03 4/18/03 local time)
Stop time: 21:59 4/19/03 UTC (16:59 4/19/03 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Not run to date.

Operational Delivery:

Technical difficulties with polarimetric algorithms limited the polarimetric variables and products available to the NWS. Missing variables included ZDR and KDP. Since hydrometeor classification is strongly dependent on ZDR, the hydrometeor classification algorithm was not run in real-time.

Snapshots:

Figure 1: Reflectivity at 8:23 UTC 19 April 2003.

Figure 2: Reflectivity at 11:45 UTC 19 April 2003.

Figure 3: Reflectivity at 20:40 UTC 19 April 2003.

Figure 4: Correlation coefficient at 4:19 UTC 19 April 2003.

Figure 5: Correlation coefficient at 11:45 UTC 19 April 2003.

Figure 6: Correlation coefficient at 20:40 UTC 19 April 2003.