October 20, 2002: Weak Cells Embedded in AP Author: Pam Heinselman, CIMMS/OU Last Updated: 7 May 2003

Forecast/Weather:

On 20 October 2002, weak cells moved from west to east over KOUN. During most of this period (especially 6:30-9:30 UTC), biological scatterers precipitation coexisted around KOUN (See Figs. below). Signatures within the correlation coefficient field and specific differential phase clearly indicate scatterers that are meteorological.

Radar Operations:

Start time: 00:04 10/20/02 UTC (19:04 10/20/02 local time)
Stop time: 13:37 10/20/02 UTC (08:37 10/20/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots: 1.5 deg elevation

Figure 1: Reflectivity at 6:29 UTC 20 October 2002.

Figure 2: Reflectivity at 7:29 20 October 2002.

Figure 3: Reflectivity at 8:28 UTC 20 October 2002.

Figure 4: Reflectivity at 9:27 UTC 20 October 2002.

Figure 5: Differential reflectivity at 6:29 UTC 20 October 2002.

Figure 6: Differential reflectivity at 7:29 20 October 2002.

Figure 7: Differential reflectivity at 8:28 UTC 20 October 2002.

Figure 8: Differential reflectivity at 9:27 UTC 20 October 2002.

Figure 9: Correlation coefficient at 6:29 UTC 20 October 2002.

Figure 10: Correlation coefficient at 7:29 20 October 2002.

Figure 11: Correlation coefficient at 8:28 UTC 20 October 2002.

Figure 12: Correlation coefficient at 9:27 UTC 20 October 2002.

Figure 13. Specific differential phase at 6:29 UTC 20 October 2002.

Figure 14: Specific differential phase at 7:29 20 October 2002.

Figure 15: Specific differential phase at 8:28 UTC 20 October 2002.

Figure 16: Specific differential phase at 9:27 UTC 20 October 2002.