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736 

WWUS20 KWNS 020325

SEL4

SPC WW 020325

ARZ000-LAZ000-MSZ000-020900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 754

NWS STORM PREDICTION CENTER NORMAN OK

1025 PM CDT THU OCT 1 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST ARKANSAS

       PARTS OF CENTRAL AND NORTHEAST LOUISIANA

       EXTREME WEST CENTRAL MISSISSIPPI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1025 PM

UNTIL 400 AM CDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH

NORTHEAST OF MONROE LOUISIANA TO 30 MILES EAST SOUTHEAST OF

NATCHITOCHES LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 752...WW 753...



DISCUSSION...BAND OF SEVERE STORMS WILL CONTINUE TO MOVE EWD/SEWD

OVERNIGHT IMMEDIATELY IN ADVANCE OF A SURFACE COLD FRONT.  THOUGH

THE ERN EXTENT OF THE LOW-LEVEL DESTABILIZATION IS IN QUESTION...A

FEED OF MOISTURE FROM THE S/SW AND RELATIVELY STEEP MID LEVEL LAPSE

RATES FROM THE W WILL MAINTAIN SUFFICIENT INSTABILITY FOR STORMS

CAPABLE OF PRODUCING DAMAGING WINDS AND ISOLATED LARGE HAIL.  DEEP

LAYER VERTICAL SHEAR WILL ALSO REMAIN SUFFICIENT FOR EMBEDDED

BOWS/SUPERCELLS AS THE PRIMARY MID LEVEL TROUGH PASSES TO THE N OF

THIS AREA.



AVIATION...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 29030.





...THOMPSON

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