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WWUS20 KWNS 261817

SEL7

SPC WW 261817

GAZ000-NCZ000-TNZ000-VAZ000-270200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 727

NWS STORM PREDICTION CENTER NORMAN OK

220 PM EDT TUE OCT 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN GEORGIA

       FAR WESTERN NORTH CAROLINA

       EASTERN TENNESSEE

       FAR WESTERN VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 220 PM UNTIL

1000 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF

CHATTANOOGA TENNESSEE TO 55 MILES NORTH OF BRISTOL TENNESSEE.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 722...WW 723...WW

724...WW 725...WW 726...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON ALONG AND IN THE WAKE OF GRAVITY WAVE

PROPAGATING SEWD THROUGH THE AREA.  AMBIENT AIR MASS CONTINUES TO

WARM/DESTABILIZE WITH MLCAPE VALUES NOW AROUND 500-1000 J/KG.  GIVEN

THE STRONG LOW AND DEEP-LAYER SHEAR IN PLACE...ENVIRONMENT WILL BE

SUPPORTIVE OF SUPERCELLS CAPABLE OF DAMAGING WINDS AND A FEW

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 23040.





...MEAD

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