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000 

WWUS20 KWNS 150019

SEL1

SPC WW 150019

ARZ000-LAZ000-MSZ000-TXZ000-150800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 111

NWS STORM PREDICTION CENTER NORMAN OK

715 PM CDT FRI MAR 14 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND CENTRAL ARKANSAS

       NORTHERN LOUISIANA

       WEST CENTRAL MISSISSIPPI

       NORTHEAST TEXAS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 715 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 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF

TEXARKANA ARKANSAS TO 35 MILES SOUTH SOUTHEAST OF GREENVILLE

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...TSTMS HAVE JUST DEVELOPED OVER NE TX/SW AR IN LOW-LEVEL

WAA ZONE ALONG WEAK WNW/ESE-ORIENTED WARM FRONT.  STORMS/SUPERCELLS

EXPECTED TO INCREASE IN WW THROUGH EARLY SATURDAY AS EXIT REGION OF

SLIGHTLY-AMPLIFYING MID/UPR JET STREAK OVER WRN OK CONTINUES ESEWD.

COMBINATION OF INCREASING LOW-LEVEL MOISTURE...MODERATE TO STRONG

SPEED/DIRECTIONAL SHEAR...AND INCREASING UVV SUGGEST POTENTIAL FOR A

FEW SUSTAINED DISCRETE SUPERCELLS THAT COULD YIELD A COUPLE

TORNADOES...IN ADDITION TO LARGE HAIL/HIGH WIND.  THE STORMS SHOULD

MERGE INTO AN MCS BY EARLY SATURDAY...WITH A CONTINUING THREAT FOR

HAIL/WIND E/NE INTO ERN AR/NW MS.



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

500. MEAN STORM MOTION VECTOR 28030.





...CORFIDI

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