

542 

WWUS20 KWNS 261429

SEL3

SPC WW 261429

ALZ000-TNZ000-262200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 723

NWS STORM PREDICTION CENTER NORMAN OK

930 AM CDT TUE OCT 26 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       MIDDLE TENNESSEE



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 930 AM UNTIL

500 PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 1.5 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHEAST OF

NASHVILLE TENNESSEE TO 55 MILES SOUTHEAST OF TUPELO MISSISSIPPI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 720...WW 721...WW 722...



DISCUSSION...A PRE-FRONTAL BAND OF CONVECTION CURRENTLY DEEPENING

FROM N-CNTRL MS NWD TO E OF MKL IS EXPECTED TO EVOLVE INTO TSTMS

LATE THIS MORNING WITHIN A STRONGLY SHEARED AND

WARMING/DESTABILIZING ENVIRONMENT.  THE COMBINATION OF EFFECTIVE SRH

OF 300-400 M2/S2...MLCAPE OF 500-1000 J/KG AND THE POTENTIAL FOR

MORE DISCRETE STORM MODES SUGGEST A THREAT LONG-TRACKED SUPERCELLS

CAPABLE OF STRONG TORNADOES.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24050.





...MEAD

