November 05, 2002: End of November 4, 2002 Stratiform Precipitation and AP/BS Author: Pam Heinselman, CIMMS/OU Last Updated: 8 April 2003

Forecast/Weather:

The stratiform precipitation from 4 November moves across eastern Oklahoma. Shortly after the rainfall moves away from central Oklahoma, AP develops northeast and south-southwest of KOUN. The dual polarimetric variables indicate that biological scatterers comprise this AP (7-13 UTC). At 12:27 UTC, it is possible that creatures are flying away from KOUN (south of radar), in alignment with the ambient northerly flow.

Radar Operations:

Start time: 00:01 11/05/02 UTC (18:01 11/04/02 local time)
Stop time: 13:29 11/05/02 UTC (05:29 11/05/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Warm season

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: Radar reflectivity shows the stratiform precipitation from 4 November continues to move across eastern Oklahoma (03:49 UTC 5 November 2002)	Figure 2: Low differential reflectivity values, colocated with weak radar reflectivity values, indicates small droplets comprise the precipitation. A mix of higher ZDR values northeast of the radar suggest the presence of biological scatterers with an area of AP (03:49 UTC 5 November 2002).
Figure 3: High correlation coefficients, colocated with weak radar reflectivity values and low ZDR, indicates light rainfall over eastern Oklahoma (03:49 UTC 5 November 2002). The area of low RhoHV northeast of KOUN, colocated with relatively high ZDRs, indicates AP, and possibly biological scatterers.	Figure 4: High values of differential reflectivity south of KOUN suggest biological scatterers were observed moving away from KOUN, in alignment with the northerly flow (12:27 UTC 5 November 2002).
Figure 5: Low correlation coefficients, colocated with high differential reflectivity values south of KOUN, suggests biological scatterers were observed at 12:27 UTC on 5 November 2002.	Figure 6: The hydrometeor classification algorithm identifies biological scatterers south of KOUN at 12:27 UTC on 5 November 2002.