

306 

WWUS20 KWNS 140001

SEL4

SPC WW 140001

ARZ000-LAZ000-140700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 904

NWS STORM PREDICTION CENTER NORMAN OK

700 PM CDT SAT SEP 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       CENTRAL AND NORTHERN LOUISIANA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 700 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 0.5 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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF EL

DORADO ARKANSAS TO 50 MILES SOUTHEAST OF FORT POLK 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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 902. WATCH NUMBER 902 WILL NOT BE IN EFFECT AFTER

700 PM CDT. CONTINUE...WW 903...



DISCUSSION...OUTER ERN BANDS OF TROPICAL STORM IKE WILL CONTINUE TO

SPREAD NWD/NNEWD ACROSS LA INTO SRN AR THROUGH THE OVERNIGHT HOURS.

THOUGH THE LOW LEVELS WILL STABILIZE SLOWLY WITH THE LOSS OF DAYTIME

HEATING...A FEED OF 75-80 F DEWPOINTS FROM THE S WILL MAINTAIN AT

LEAST WEAK INSTABILITY OVERNIGHT.  GIVEN THE PRESENCE OF SOME

INSTABILITY AND RICH MOISTURE...THE STRONG LOW-LEVEL SHEAR WILL

STILL SUPPORT A THREAT FOR ISOLATED SUPERCELLS AND PERHAPS A COUPLE

OF TORNADOES.



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

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 19045.





...THOMPSON

