

627 

WWUS20 KWNS 100123

SEL6

SPC WW 100123

ARZ000-LAZ000-TXZ000-100700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 126

NWS STORM PREDICTION CENTER NORMAN OK

825 PM CDT THU APR 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ARKANSAS

       NORTHWEST LOUISIANA

       EXTREME NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 825 PM

UNTIL 200 AM CDT.



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 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST SOUTHWEST OF

TEXARKANA ARKANSAS TO 40 MILES EAST OF EL DORADO ARKANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 123...WW 125...



DISCUSSION...THOUGH THE 00Z SHV SOUNDING REVEALED A SUBSTANTIAL CAP

IN ADVANCE OF THE DRYLINE ACROSS NE TX...IT APPEARS CONVECTIVE

DEVELOPMENT WILL BE AIDED FOR THE NEXT FEW HOURS BY ASCENT ON THE

SRN FRINGE OF THE MID LEVEL TROUGH EJECTING EWD OVER OK.  THE

COMBINATION OF MODERATE INSTABILITY /MLCAPE OF 1000-1500 J/KG/ AND

STRONG VERTICAL SHEAR WILL CONTINUE TO SUPPORT A THREAT FOR

SUPERCELLS WITH A COUPLE OF TORNADOES...LARGE HAIL...AND DAMAGING

WINDS.



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 27035.





...THOMPSON

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