WATCHES: Severe Thunderstorm Watch Number 664

WWUS20 KWNS 052024
SEL4
SPC WW 052024
OKZ000-TXZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 664
NWS STORM PREDICTION CENTER NORMAN OK
325 PM CDT WED AUG 5 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EXTREME SOUTH CENTRAL OKLAHOMA
NORTH CENTRAL TEXAS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
1000 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES NORTH
NORTHWEST OF FORT WORTH TEXAS TO 80 MILES EAST OF DALLAS TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...PREVIOUSLY ELEVATED THUNDERSTORM OVER CENTRAL/ERN OK
HAVE BECOME SURFACE-BASED AS THEY MOVE GENERALLY SWD INTO A HOT AND
MOIST SURFACE ENVIRONMENT...WHERE SURFACE TEMPERATURES ARE NEAR 100F
AND DEW POINTS ARE IN THE UPPER 60S-LOWER 70S. THE STORMS APPEAR TO
HAVE DEVELOPED AN ORGANIZED COLD POOL WHICH IS EXPECTED TO SPREAD
SWD/SSWWD ACROSS THE RED RIVER INTO NRN TX DURING THE NEXT SEVERAL
HOURS. THERE IS POTENTIAL FOR ADDITIONAL UPDRAFTS TO DEVELOP WWD
ALONG THE OUTFLOW BOUNDARY MOVING INTO EXTREME SOUTH CENTRAL
OKLAHOMA...WITH RESULTANT SWWD PROPAGATION TO THE CONVECTIVE SYSTEM.
DAMAGING WIND GUSTS AND OCCASIONAL HAIL ARE LIKELY WITH THE SYSTEM.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 34020.

...WEISS

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