August 27, 2002: AP Behind and Embedded w/in Stratiform Event Author: Pam Heinselman, CIMMS/OU Last Updated: 21 April 2003

Forecast/Weather:

On 27 August 2002, areas of anonmalous propagation are found behind a region of stratiform precipitation as it moves from southeastern Oklahoma into northeastern Texas. The AP is characterized by the following polarimetric signatures: high radar reflectivity (Fig. 1), low differential reflectivity (Fig. 2), correlation coefficients ranging from 0.7-0.90 (Fig. 3), and the absence of specific differential phase (Fig. 4). The HCA does a good job finding areas of AP (Fig. 5).

Radar Operations:

Start time: 14:58 8/27/02 UTC (09:58 8/27/02 local time)
Stop time: 16:20 8/27/02 UTC (11:20 8/27/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: Reflectivity at 15:08 UTC 27 August 2002.	Figure 2: Differential reflectivity at 15:08 UTC 27 August 2002.
Figure 3: Correlation coefficient at 15:08 UTC 27 August 2002.	Figure 4: Specific differential phase at 15:08 UTC 27 August 2002.

Figure 5: Hydrometeor classification at 15:08 UTC 27 August 2002.