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WWUS20 KWNS 010115

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 123

NWS STORM PREDICTION CENTER NORMAN OK

815 PM CDT SAT MAR 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST INTO WEST CENTRAL ALABAMA

       NORTHEAST MISSISSIPPI



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 815 PM

UNTIL 100 AM 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 40

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF MUSCLE SHOALS ALABAMA TO 10 MILES WEST SOUTHWEST OF

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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 121...SEVERE THUNDERSTORM WATCH

NUMBER 122. WATCH NUMBER 121 122 WILL NOT BE IN EFFECT AFTER 815

PM CDT.



DISCUSSION...A COMBINED NNW-SSE ORIENTED OUTFLOW BOUNDARY FROM

CENTRAL AL NWWD INTO NW AL/NE MS WILL CONTINUE TO FOCUS THUNDERSTORM

DEVELOPMENT/MAINTENANCE FOR THE NEXT FEW HOURS.  MODERATE

INSTABILITY REMAINS TO THE S OF THE ONGOING STORMS...AND DEEP-LAYER

VERTICAL SHEAR IS AT LEAST MARGINALLY FAVORABLE FOR SUPERCELLS.

THOUGH CONVECTIVE INHIBITION WILL INCREASE SLOWLY WITH BOUNDARY

LAYER COOLING...THE MODERATE INSTABILITY AND ORGANIZED NATURE OF THE

STORMS SUGGEST THAT THE LARGE HAIL/DAMAGING WIND RISK WILL CONTINUE

FOR A FEW MORE HOURS.



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 36020.





...THOMPSON

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