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258 

WWUS20 KWNS 241727

SEL3

SPC WW 241727

ARZ000-LAZ000-OKZ000-TXZ000-250000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 13

NWS STORM PREDICTION CENTER NORMAN OK

1125 AM CST THU FEB 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       A LARGE PART OF ARKANSAS

       PARTS OF NORTHERN LOUISIANA

       PASTS OF SOUTHEASTERN OKLAHOMA

       PARTS OF NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1125 AM UNTIL

600 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 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF

RUSSELLVILLE ARKANSAS TO 25 MILES SOUTHEAST OF SHREVEPORT

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...THUNDERSTORMS ARE INCREASING IN NUMBER ACROSS ERN OK

INTO NERN TX AHEAD OF STRONG S/WV TROUGH AND DEVELOPING SURFACE LOW.

 WITH AIR MASS NOW FAVORABLY UNSTABLE AND NEARLY

UNCAPPED...POTENTIAL FOR SEVERE THUNDERSTORMS INCLUDING SUPERCELLS

WILL INCREASE EWD ACROSS THE WATCH THRU THE AFTERNOON.  E/W WARM

FRONT ACROSS CENTRAL AR WILL BE AN AREA FOR ENHANCED LOW LEVEL

SHEAR/SUPERCELL DEVELOPMENT.  TORNADOS WILL BE POSSIBLE WITH ANY

SUPERCELL THAT DEVELOPS.



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

500. MEAN STORM MOTION VECTOR 24045.





...HALES

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