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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 321

NWS STORM PREDICTION CENTER NORMAN OK

705 AM CDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH-CENTRAL AND EASTERN ARKANSAS

       FAR NORTHERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 705 AM UNTIL 200

PM 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 70

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

SOUTHWEST OF HOT SPRINGS ARKANSAS TO 45 MILES NORTHEAST OF TUPELO

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...ON THE NOSE OF A MODERATELY STRONG LOW LEVEL

JET...ELEVATED TSTMS ARE EXPECTED TO CONTINUE TO EXPAND

EAST-NORTHEASTWARD ACROSS AR INTO NORTHERN MS/WESTERN TN THROUGH THE

MORNING. THE 12Z OBSERVED RAOB FROM LITTLE ROCK WAS INDICATIVE OF

STEEP LAPSE RATES ALOFT/AMPLE ELEVATED INSTABILITY...WHICH WILL BE

SUPPORTIVE OF SEVERE HAIL THIS MORNING. IT IS POSSIBLE THAT SOME OF

THESE STORMS MAY REMAIN SUSTAINED AND BECOME SURFACE BASED BY LATE

THIS MORNING/MIDDAY...WITH INCREASING POTENTIAL FOR DAMAGING WIND

GUSTS IN ADDITION TO SEVERE HAIL.



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 500. MEAN STORM

MOTION VECTOR 24030.





...GUYER/CORFIDI

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