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WWUS20 KWNS 051758

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SPC WW 051758

ARZ000-OKZ000-TXZ000-060100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 34

NWS STORM PREDICTION CENTER NORMAN OK

1200 PM CST TUE FEB 5 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM NOON UNTIL 700

PM CST.



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

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF

PARIS TEXAS TO 20 MILES EAST OF DE QUEEN ARKANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...CONVECTION IS BEGINNING TO DEEPEN ALONG THE DRYLINE IN

N TX/SRN OK...AS WELL AS ALONG A PRE-FRONTAL BAND FROM NE TX INTO SE

OK.  THE PRE-FRONTAL BAND IS ASSOCIATED WITH A LEAD SHORTWAVE TROUGH

AND THE W EDGE OF THE STRONGER CAP...AND THIS ZONE OF ASCENT WILL

LIKELY SPREAD NEWD TOWARD SW/WRN AR THIS AFTERNOON.  GIVEN THE

PRESENCE OF 0-6 KM SHEAR IN EXCESS OF 60 KT...0-1 KM SRH NEAR 200

M2/S2...BOUNDARY LAYER DEWPOINTS IN THE LOW 60S...AND MLCAPE NEAR

1000 J/KG...A FEW SUPERCELLS WITH TORNADOES WILL BE POSSIBLE.  LARGE

HAIL AND DAMAGING WINDS CAN ALSO BE EXPECTED WITH THE STRONGER

STORMS.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 23045.





...THOMPSON

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