509
FLUS74 KOUN 140905
AWUOUN

AREA WEATHER UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
405 AM CDT SUN AUG 14 2005

...WARNING DECISION UPDATE...

..THIS WARNING DECISION UPDATE CONCERNS NORTH TEXAS AND SOUTHERN 
OKLAHOMA...

COMPARISON OF KTLX RAINFALL ESTIMATES TO MESONET AND METARS INDICATE 
THAT RADAR ESTIMATES ARE SIGNIFICANTLY LOW THIS MORNING. ON THE 
AVERAGE... MEASURED RAINFALL HAS BEEN ABOUT 30 PERCENT OVER RADAR 
ESTIMATES BUT IN SOME LOCATIONS BEEN SIGNIFICANTLY MORE.

REFLECTIVITY STRUCTURES DO SUGGEST WARM RAIN PROCESSES AND THE 
STANDARD RADAR Z/R RELATIONSHIP LIKELY DOES NOT APPLY WELL. AT THE 
MOMENT WILL NOT CHANGE Z/R RELATIONSHIP ON THE RADAR AS THIS WILL 
INTERFERE WITH LONGER-DURATION ACCUMULATION ESTIMATES. BUT USERS 
SHOULD BE AWARE OF THIS UNDERESTIMATION OF RAINFALL.

FLASH FLOOD WARNING HAD BEEN ISSUED FOR CLAY COUNTY TEXAS WITH 
TRAINING ECHOES OVER THE AREA THIS MORNING. THE LATEST HEAVY RAIN 
THUNDERSTORM COMPLEX HAS MOVED INTO JEFFERSON COUNTY OKLAHOMA... BUT 
INTO AN AREA THAT HAD LESS RAINFALL THIS MORNING. THIS COMPLEX 
IS ALSO BEING WATCHED FOR POTENTIAL WIND THREAT.

$$
...SPEG.