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of August 13-15, 2005 Exercise Question 6 |
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6. At 4:00 am CDT on the 14th, the Norman WFO issued the following Warning Decision Update.
- What does it tell you about using radar-estimated precipitation for the rest of the day?
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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.
