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WWUS20 KWNS 140105

SEL8

SPC WW 140105

ARZ000-LAZ000-MSZ000-140600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 578

NWS STORM PREDICTION CENTER NORMAN OK

800 PM CDT MON AUG 13 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHEAST ARKANSAS

       FAR NORTHEAST LOUISIANA

       CENTRAL MISSISSIPPI



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 800 PM UNTIL

100 AM 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES EAST

NORTHEAST OF GREENWOOD MISSISSIPPI TO 10 MILES SOUTHWEST OF

JACKSON 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 577...



DISCUSSION...SCTD TSTMS...INCLUDING SEMI-DISCRETE SUSTAINED STORMS

AND TRANSIENT SUPERCELLS IN SHORT BANDS AND CLUSTERS...EXPECTED TO

PERSIST THROUGH LATE EVE IN ZONE OF WAA ON W SIDE OF RETREATING COOL

DOME LEFT BY EARLIER MCS.  MODERATE WNWLY DEEP SHEAR...VERY MOIST

LOW LVL ENVIRONMENT...AND FAIRLY STEEP MID LVL LAPSE RATES MAY

CONTINUE TO YIELD SVR HAIL AND LOCALLY DMGG WIND. A TORNADO ALSO

CANNOT BE RULED OUT...AND THIS POTENTIAL WILL CONTINUE TO BE

MONITORED. BUT GIVEN CURRENT DOMINANT STORM CONFIGURATION /BROKEN

CLUSTERS/...ONSET OF NIGHTFALL /WITH LESSENING LOW LVL LAPSE

RATES/...AND LITTLE INCREASE IN STRENGTH OF LOW LVL FLOW EXPECTED

THROUGH LATE EVE...POTENTIAL SEEMS TOO LOW TO WARRANT A TORNADO

WATCH ATTM.



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 550. MEAN STORM

MOTION VECTOR 29020.





...CORFIDI

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