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WWUS20 KWNS 250107

SEL4

SPC WW 250107

ARZ000-LAZ000-OKZ000-TXZ000-250800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 364

NWS STORM PREDICTION CENTER NORMAN OK

810 PM CDT TUE MAY 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND NORTHERN ARKANSAS

       EXTREME NORTHWEST LOUISIANA

       EXTREME EASTERN OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 810 PM

UNTIL 300 AM CDT.



TORNADOES...HAIL TO 2.5 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 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF

FAYETTEVILLE ARKANSAS TO 45 MILES WEST OF SHREVEPORT LOUISIANA.

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.



OTHER WATCH INFORMATION...CONTINUE...WW 356...WW 360...WW

361...WW 362...WW 363...



DISCUSSION...BROKEN BAND OF WARM SECTOR SUPERCELLS WILL LIKELY

PERSIST INTO THE EARLY OVERNIGHT HOURS AS THE STRONG MIDLEVEL TROUGH

PROGRESSES EWD OVER N TX AND OK.  INSTABILITY IS NOT AS STRONG AS

EARLIER AND FARTHER W...BUT SHOULD REMAIN SUFFICIENT FOR STRONG

UPDRAFTS.  VERTICAL SHEAR WILL INCREASE FROM W TO E WITH THE

APPROACH OF THE MIDLEVEL TROUGH...AND WILL BE SUPPORTIVE OF

SUPERCELLS WITH A RISK FOR TORNADOES...LARGE HAIL...AND DAMAGING

WINDS.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 26035.





...THOMPSON

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