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915 

WWUS20 KWNS 242059

SEL8

SPC WW 242059

ARZ000-LAZ000-MSZ000-250300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 708

NWS STORM PREDICTION CENTER NORMAN OK

400 PM CDT SUN OCT 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST-CENTRAL ARKANSAS

       FAR NORTHEAST LOUISIANA

       NORTHERN AND WESTERN MISSISSIPPI



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1000 PM CDT.



HAIL TO 1.5 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTH

SOUTHWEST OF GREENVILLE MISSISSIPPI TO 30 MILES EAST OF OXFORD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 707...



DISCUSSION...SEVERE TSTMS IN PROGRESS OVER SERN AR/NERN LA ARE

EXPECTED TO MOVE/DEVELOP EWD INTO WW AREA LATE THIS AFTERNOON INTO

EVENING.  SURFACE OBSERVATIONS INDICATE THAT CONSIDERABLE BOUNDARY

LAYER MIXING HAS LED TO 20-25 F T/TD SPREADS WITH MLCAPE OF AROUND

1000 J/KG.  GIVEN THE PRESENCE OF 35-45 KT OF DEEP WLY SHEAR...SETUP

WILL FAVOR LARGELY OUTFLOW-DOMINANT CONVECTIVE MODES WITH A RISK FOR

DAMAGING WINDS AND HAIL INTO EARLY EVENING.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24030.





...MEAD

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