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944 

WWUS20 KWNS 242016

SEL0

SPC WW 242016

ARZ000-MOZ000-250200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 60

NWS STORM PREDICTION CENTER NORMAN OK

315 PM CDT TUE MAR 24 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST ARKANSAS

       SOUTHEAST MISSOURI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 315 PM UNTIL

900 PM 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF CAPE GIRARDEAU MISSOURI TO 60 MILES SOUTH SOUTHWEST

OF BATESVILLE ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...FRONTAL SQUALL LINE HAS SLOWLY INTENSIFIED THE PAST 1-2

HOURS...AND IT APPEARS THAT THE THREAT FOR DAMAGING WINDS HAS

LIKEWISE INCREASED.  A FOCUSED BAND OF ASCENT...STRONG WIND

FIELDS...AND LOW-MID LEVEL SHEAR WILL BE MAINTAINED OVER THE AREA

THROUGH THE AFTERNOON AS A MID LEVEL SHORTWAVE TROUGH PIVOTS ENEWD

FROM OK TO MO.  THIS...ALONG WITH A MODEST INCREASE IN LOW-LEVEL

MOISTURE AND ASSOCIATED WEAK DESTABILIZATION...SHOULD CONTINUE TO

SUPPORT A THREAT FOR DAMAGING WINDS WITH EMBEDDED BOWING SEGMENTS.

ADDITIONALLY...AN ISOLATED TORNADO CANNOT BE RULED OUT GIVEN THE

STRONG LOW-LEVEL SHEAR...THOUGH WEAK INSTABILITY WILL GENERALLY

LIMIT THE TORNADO THREAT.



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 450. MEAN STORM MOTION

VECTOR 24045.





...THOMPSON

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