June 4, 2002: Mature Squall Line w/ Hail and Heavy Rain Author: Pam Heinselman, CIMMS/OU Last Updated: 24 April 2003

Forecast/Weather:

On 4 June 2002, a north-to-south-oriented squall line develops in western Oklahoma and moves eastward to central Oklahoma during the afternoon. The specific differential phase field indicates that heavy rain fell from convective cells located at the northern and southern ends of the squall line (Figs 4,8,12). Polarimetric signatures indicate that hail possibly develops within the northmost convective cell (see Figs. 3-8). However, this signature is high enough AGL that the hail may have melted before reaching the ground. Toward evening, a polarimetric signatures clearly indicate bright bands within the two largest stratiform regions (north OK and west OK, see Figs. 9-12)

Radar Operations:

Start time: 17:15 6/4/02 UTC (12:15 5/4/02 local time)
Stop time: 23:51 6/4/02 UTC (18:51 5/4/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: Reflectivity at 21:10 UTC on 4 June 2002.	Figure 2: Differential reflectivity at 21:10 UTC on 4 June 2002.
Figure 3: Correlation coefficient at 21:10 UTC on 4 June 2002.	Figure 4: Specific differential phase at 21:10 UTC on 4 June 2002.

Figure 5: Reflectivity at 22:19 UTC on 4 June 2002.	Figure 6: Differential reflectivity at 22:19 UTC on 4 June 2002.
Figure 7: Correlation coefficient at 22:19 UTC on 4 June 2002.	Figure 8: Specific differential phase at 22:19 UTC on 4 June 2002.

Figure 9: Reflectivity at 23:51 UTC on 4 June 2002.	Figure 10: Differential reflectivity at 23:51 UTC on 4 June 2002.
Figure 11: Correlation coefficient at 23:51 UTC on 4 June 2002.	Figure 12: Specific differential phase at 23:51 UTC on 4 June 2002.