August 29, 2002: Significant AP around KOUN Author: Pam Heinselman, CIMMS/OU Last Updated: 11 April 2003

Forecast/Weather:

On 29 August, between 03:35 - 12:49 UTC, a large region of anonmalous propagation surrounds KOUN. This AP may be caused by a strong surface inversion at Norman (see Fig. 4).

Radar Operations:

Start time: 03:35 08/29/02 UTC (22:35 08/29/02 local time)
Stop time: 12:49 08/29/02 UTC (07:49 08/30/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: Anomalous propagation east of KOUN is represented by a north-south-oriented line of high reflectivity at 12:49 UTC 29 August 2002.	Figure 2: Low differential reflectivity values, colocated with the high reflectivities, indicates AP at 12:49 UTC 29 August 2002.
Figure 3: The hydrometeor classification algorithm correctly identifies AP at 12:49 UTC 29 August 2002.	Figure 4: The Norman sounding at 12 UTC 29 August shows a strong surface inversion which is may be responsible for ducting of the radar beam and therefore the AP.