September 9, 2002: Stratiform Precipitation Author: Pam Heinselman, CIMMS/OU Last Updated: 14 April 2003

Forecast/Weather:

On September 9, 2002, the dissipation of precipitation marks the end of the 8 September precipitation event (00:00-01:42 UTC). Later, a new area of stratiform precipitation moves across southern Oklahoma following a pattern similar to the 8th (from east to west).

Radar Operations:

Start time: 00:02 9/9/02 UTC (19:02 9/8/02 local time)
Stop time: 01:42 9/9/02 UTC (20:42 9/8/02 local time)

Start time: 13:54 9/9/02 UTC (8:02 9/9/02 local time)
Stop time: 18:59 9/9/02 UTC (13:42 9/9/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold
Radar: Calibration is likely too high because correlation coeffients are greater than one.

Operational Delivery:

Not applicable.

Snapshots:

Figure 1: On 9 September 2002, at 14:55 UTC, the radar reflectivity field indicates stratiform precipitation over southern Oklahoma.	Figure 2: On 9 September 2002, at 14:55 UTC, the differential reflectivity field indicates nearly spherical particles comprise the stratiform precipitation. The colocation of such small ZDRs with low reflectivity suggests small droplets are observed.
Figure 3: On 9 September 2002, at 14:55 UTC, the specific differential reflectivity indicates light rain rates across most of southern Oklahoma.	Figure 4: On 9 September 2002, at 14:55 UTC, the hydrometeor classfication algorithm identifies mostly stratiform precipitation across southern Oklahoma.