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WWUS20 KWNS 291703

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ARZ000-OKZ000-TXZ000-300100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 7

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM CST TUE JAN 29 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1100 AM UNTIL 700

PM CST.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF POTEAU

OKLAHOMA TO 80 MILES SOUTH OF PARIS TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU7).



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 5...WW 6...



DISCUSSION...A BAND OF PRE-FRONTAL ASCENT OVERSPREADING NE TX/SE OK

WILL SUPPORT NEW THUNDERSTORM DEVELOPMENT THROUGH THIS AFTERNOON

WITHIN THE UNSTABLE WARM SECTOR.  THOUGH CLOUDS ARE LIMITING SURFACE

HEATING...DEWPOINTS IN THE MID 60S AND REMNANT STEEP MIDLEVEL LAPSE

RATES WILL DRIVE MLCAPE TO THE 750-1500 J/KG RANGE BY EARLY-MID

AFTERNOON.  VERTICAL SHEAR IS FAVORABLE FOR SUPERCELLS AND BOWING

SEGMENTS ACROSS THE WATCH AREA...AND THIS WILL SUPPORT A RISK FOR

TORNADOES...DAMAGING WINDS...AND AT LEAST ISOLATED LARGE HAIL

THROUGH THIS EVENING.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 23045.





...THOMPSON

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