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154 

WWUS20 KWNS 061428

SEL4

SPC WW 061428

ALZ000-GAZ000-SCZ000-062300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 254

NWS STORM PREDICTION CENTER NORMAN OK

1030 AM EDT WED MAY 6 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       LARGE PART OF NORTHERN AND CENTRAL ALABAMA

       MUCH OF NORTH AND PARTS OF CENTRAL GEORGIA

       PARTS OF WESTERN SOUTH CAROLINA



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1030 AM UNTIL

700 PM EDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 115 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES WEST SOUTHWEST OF

AUBURN ALABAMA TO 70 MILES NORTHEAST OF ROME GEORGIA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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 252...WW 253...



DISCUSSION...WELL DEVELOPED SQUALL LINE WITH EMBEDDED SUPERCELLS

WILL CONTINUE EWD ACROSS THE WATCH AREA. WITH STRONG VEERING SHEAR

PROFILES IN PLACE AND STEEP MID LEVEL LAPSE RATES ALONG WITH MLCAPES

AOA 1500 J/KG...SEVERE THREAT WILL CONTINUE AND LIKELY INCREASE WITH

DIURNAL HEATING. IN ADDITION TO TORNADO POTENTIAL ASSOCIATED WITH

ANY EMBEDDED ROTATIONS WITHIN LINE...MORE DISCRETE SUPERCELLS COULD

DEVELOP IN ADVANCE OF MAIN LINE AS AIR MASS CONTINUES TO

DESTABILIZE.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24035.





...HALES

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