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773 

WWUS20 KWNS 120545

SEL0

SPC WW 120545

ALZ000-MSZ000-121100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 30

NWS STORM PREDICTION CENTER NORMAN OK

1145 PM CST THU MAR 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ALABAMA

       CENTRAL AND NORTHEAST MISSISSIPPI



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1145 PM

UNTIL 500 AM CST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF

JACKSON MISSISSIPPI TO 50 MILES NORTH NORTHEAST OF COLUMBUS

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THUNDERSTORMS ARE INCREASING ALONG A SURFACE FRONT OVER

CENTRAL MS.  THIS ACTIVITY WILL SPREAD NORTHEASTWARD THROUGH THE

EARLY MORNING HOURS TOWARD NORTHWEST AL.  INSTABILITY IS WEAK...BUT

STEEP LAPSE RATES AND SUFFICIENT DEEP LAYER VERTICAL SHEAR WILL

SUPPORT A FEW INTENSE UPDRAFTS CAPABLE OF LARGE HAIL.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM

MOTION VECTOR 24035.





...HART

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