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000 

WWUS20 KWNS 090100

SEL1

SPC WW 090100

OKZ000-TXZ000-090500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 261

NWS STORM PREDICTION CENTER NORMAN OK

755 PM CDT TUE MAY 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND CENTRAL OKLAHOMA

       NORTH TEXAS



EFFECTIVE THIS TUESDAY NIGHT FROM 755 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF CHANDLER

OKLAHOMA TO 30 MILES SOUTH SOUTHEAST OF SHERMAN TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 258...WW 259...WW 260...



DISCUSSION...MCV OVER NW TX HAS STRENGTHENED LARGER SCALE WIND FIELD

ACROSS THE RED RVR VLY REGION.  BACKED LOWER LEVEL FLOW DOWNSTREAM

ACROSS CNTRL OK...AND PRESENCE OF WEAK OUTFLOW BOUNDARIES THAT HAVE

BEEN DRAWN INTO THE MCV CIRCULATION...MAY CONTINUE TO ENHANCE

POTENTIAL FOR LOW LEVEL STORM ROTATION/BRIEF TORNADOES GIVEN MOIST

LOW LEVEL ENVIRONMENT.  FARTHER S...A SPIN-UP TORNADO AND/OR STRONG

WIND GUSTS MAY PERSIST ALONG ASSOCIATED BOW ACROSS THE RED RVR INTO

S CNTRL OK.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 24035.





...CORFIDI

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