

000 

WWUS20 KWNS 102047

SEL8

SPC WW 102047

OKZ000-TXZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 508

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT TUE JUL 10 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST OKLAHOMA

       NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1000 PM CDT.



HAIL TO 1.5 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST

OF ARDMORE OKLAHOMA TO 40 MILES EAST OF PARIS TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 504...WW 505...WW

506...WW 507...



DISCUSSION...STRONG/SEVERE STORMS WILL LIKELY DEVELOP ALONG A

REMNANT OUTFLOW BOUNDARY JUST N OF THE RED RIVER...WITH STORMS FED

BY MID 70 DEWPOINTS AND STRONG INSTABILITY FROM THE SW.  THIS AREA

IS ALONG THE SWRN FLANK OF A MID LEVEL VORTICITY CENTER OVER ERN

OK...WHERE MODEST NWLY MID LEVEL FLOW WILL RESULT IN SUFFICIENT

VERTICAL SHEAR FOR ORGANIZED MULTICELL CLUSTERS...AND PERHAPS

SUPERCELLS.  A BRIEF/WEAK TORNADO CANNOT BE RULED OUT...BUT THE

PRIMARY SEVERE THREAT SHOULD BE DAMAGING DOWNBURST WINDS...ALONG

WITH LARGE HAIL WITH THE MOST INTENSE STORMS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 30020.





...THOMPSON

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