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427 

WWUS20 KWNS 112046

SEL9

SPC WW 112046

ALZ000-GAZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 99

NWS STORM PREDICTION CENTER NORMAN OK

445 PM EDT THU APR 11 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN ALABAMA

       WEST CENTRAL AND NORTHWEST GEORGIA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 445 PM UNTIL

1100 PM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF

ROME GEORGIA TO 20 MILES SOUTHEAST OF MONTGOMERY ALABAMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 96...WW 97...WW 98...



DISCUSSION...PRE-FRONTAL CONVECTION CONTINUES TO DEVELOP ACROSS E

CENTRAL AL IN AN ENVIRONMENT OF MODERATE INSTABILITY AND SLOWLY

INCREASING VERTICAL SHEAR.  SOME OF THESE STORMS COULD CONTINUE TO

DEVELOP SUPERCELL STRUCTURES FOR THE NEXT FEW HOURS...AND THE

STRONGEST STORMS MAY POSE A RISK FOR A TORNADO OR TWO.

OTHERWISE...THE FRONTAL SQUALL LINE IN AL WILL PROGRESS EWD INTO GA

LATE THIS EVENING THROUGH EARLY TONIGHT...WITH A CONTINUING RISK FOR

DAMAGING GUSTS AND PERHAPS A COUPLE OF EMBEDDED CIRCULATIONS WITH

QLCS TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 24035.





...THOMPSON

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