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WWUS20 KWNS 270104

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 730

NWS STORM PREDICTION CENTER NORMAN OK

805 PM CDT TUE OCT 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND NORTHEAST ALABAMA

       NORTHERN GEORGIA



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 805 PM

UNTIL 200 AM CDT.



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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST SOUTHWEST OF

BIRMINGHAM ALABAMA TO 45 MILES NORTH NORTHEAST OF ATHENS GEORGIA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 728. WATCH NUMBER 728 WILL NOT BE IN EFFECT AFTER

805 PM CDT. CONTINUE...WW 726...WW 727...WW 729...



DISCUSSION...QUASI-STATIONARY BAND OF TRAINING STORMS WILL LIKELY

PERSIST FOR SEVERAL MORE HOURS AS THE SYNOPTIC FRONT STALLS WITH

DEEP-LAYER FLOW PARALLEL TO THE BOUNDARY.  DESPITE THE LOSS OF

SURFACE HEATING...BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S AND A

CONTINUATION OF A 40 KT SWLY LLJ WILL MAINTAIN SUFFICIENT

INSTABILITY AND LOW-LEVEL SHEAR FOR AN EMBEDDED SUPERCELL AND

TORNADO THREAT.



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 26035.





...THOMPSON

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