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WWUS20 KWNS 131944

SEL3

SPC WW 131944

ARZ000-LAZ000-MSZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 473

NWS STORM PREDICTION CENTER NORMAN OK

245 PM CDT MON JUN 13 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST ARKANSAS

       EXTREME NORTHEAST LOUISIANA

       CENTRAL MISSISSIPPI



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 245 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 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF GREENVILLE MISSISSIPPI TO 20 MILES EAST SOUTHEAST OF MERIDIAN

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 472...



DISCUSSION...MCS OVER NW MS WILL CONTINUE TO MOVE SWD ALONG THE

INSTABILITY AXIS...IN AN ENVIRONMENT WITH 30 KT NNWLY/NLY MIDLEVEL

FLOW.  MLCAPE NEAR 2500 J/KG AND STEEP LOW-LEVEL LAPSE RATES WILL

CONTINUE TO SUPPORT A RISK OF DAMAGING OUTFLOW WINDS THROUGH THE

AFTERNOON...ALONG WITH THE POTENTIAL FOR MARGINALLY SEVERE HAIL.



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 35035.





...THOMPSON

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