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148 

WWUS20 KWNS 312205

SEL2

SPC WW 312205

ALZ000-010200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 122

NWS STORM PREDICTION CENTER NORMAN OK

505 PM CDT SAT MAR 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN AND CENTRAL ALABAMA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 505 PM UNTIL

900 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES WEST

NORTHWEST OF BIRMINGHAM ALABAMA TO 30 MILES NORTHEAST OF ANNISTON

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 121...



DISCUSSION...A CLUSTER OF MULTICELLS AND EMBEDDED SUPERCELLS WILL

CONTINUE TO SPREAD SWD FROM NRN TOWARD CENTRAL AL THROUGH THIS

EVENING.  MODERATE INSTABILITY AND EFFECTIVE BULK SHEAR AOA 30 KT

WILL MAINTAIN A RISK FOR ORGANIZED STORMS CAPABLE OF PRODUCING LARGE

HAIL/DAMAGING WINDS...PRIOR TO THE LOSS OF DAYTIME HEATING AND

STABILIZATION OF THE BOUNDARY LAYER BY EARLY TONIGHT.



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 35020.





...THOMPSON

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