

000 

WWUS20 KWNS 110448

SEL2

SPC WW 110448

ARZ000-111100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 122

NWS STORM PREDICTION CENTER NORMAN OK

1150 PM CDT TUE APR 10 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ARKANSAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1150 PM

UNTIL 600 AM CDT.



HAIL TO 2 INCHES 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST OF HOT

SPRINGS ARKANSAS TO 55 MILES EAST NORTHEAST OF PINE BLUFF

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...ELEVATED THUNDERSTORMS...INCLUDING SUPERCELLS...WILL

LIKELY PERSIST AND EVEN INCREASE IN COVERAGE ACROSS AR THE NEXT FEW

HOURS AS A MID LEVEL TROUGH MOVES EWD FROM OK.  A FEED OF SOMEWHAT

GREATER MOISTURE/INSTABILITY FROM LA INTO SRN/ERN AR OVERNIGHT MAY

SUPPORT INTENSIFICATION OF THE CONVECTION N OF THE SURFACE WARM

FRONT...WHERE EFFECTIVE BULK SHEAR REMAINS SUFFICIENT FOR

SUPERCELLS.  LARGE HAIL WILL BE THE PRIMARY SEVERE THREAT...THOUGH

THERE MAY BE SOME TENDENCY FOR AN INCREASING WIND DAMAGE THREAT

LATER TONIGHT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 28045.





...THOMPSON

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