

335 

WWUS20 KWNS 110707

SEL5

SPC WW 110707

ARZ000-LAZ000-MSZ000-TXZ000-111200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 15

NWS STORM PREDICTION CENTER NORMAN OK

105 AM CST WED FEB 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST ARKANSAS

       CENTRAL AND NORTHERN LOUISIANA

       EXTREME WEST CENTRAL MISSISSIPPI

       EXTREME SOUTHEAST TEXAS



EFFECTIVE THIS WEDNESDAY MORNING FROM 105 AM UNTIL 600 AM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

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

MONTICELLO ARKANSAS TO 35 MILES SOUTHWEST OF FORT POLK LOUISIANA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 12...WW 13...WW 14...



DISCUSSION...STRONGLY FORCED SQUALL LINE WILL CONTINUE EWD FROM TX

ACROSS LA/SRN AR TO NEAR THE MS RIVER BY 11-12Z...AS AN INTENSE MID

LEVEL TROUGH OVER CENTRAL TX EJECTS ENEWD.  AN INFLUX OF LOW-MID 60S

DEWPOINTS AND SBCAPE VALUES NEAR 500 J/KG WILL BE MAINTAINED BY A

60-70 KT SLY LLJ...AND THIS LLJ WILL ALSO CONTRIBUTE TO VERY STRONG

LOW-LEVEL SHEAR AND THE POTENTIAL FOR EMBEDDED

CIRCULATIONS/TORNADOES WITHIN THE LINE.  OTHERWISE...DAMAGING WINDS

WILL BE THE PRIMARY SEVERE THREAT THROUGH THE EARLY MORNING HOURS.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 26040.





...THOMPSON

