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310 

WWUS20 KWNS 111831

SEL3

SPC WW 111831

ALZ000-ARZ000-ILZ000-KYZ000-MSZ000-TNZ000-120200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 373

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT MON JUN 11 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR NORTHWEST ALABAMA

       CENTRAL AND EASTERN ARKANSAS

       FAR SOUTHERN ILLINOIS

       WESTERN KENTUCKY

       NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 5 MILES SOUTH

SOUTHWEST OF HOT SPRINGS ARKANSAS TO 65 MILES NORTH NORTHEAST OF

MUSCLE SHOALS ALABAMA.  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 372...



DISCUSSION...BOW ECHO MCS WITH A HISTORY OF DAMAGING WINDS AND LARGE

HAIL IS EXPECTED TO CONTINUE SEWD ACROSS THE WATCH AREA THIS

AFTERNOON AND EVENING...PERHAPS ACCELERATING WITH TIME.  INFLOW AIR

MASS IS CHARACTERIZED BY STEEP MIDLEVEL LAPSE RATES AND RICH

BOUNDARY LAYER MOISTURE...YIELDING MLCAPE VALUES OF 2000-4000 J/KG.

WHEN COUPLED WITH A 40-50 KT DESCENDING MESOSCALE REAR INFLOW JET

/PER SGF VAD OBS/...SETUP APPEARS FAVORABLE FOR A WIDESPREAD

DAMAGING WIND EVENT.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 30035.





...MEAD

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