

357 

WWUS20 KWNS 111710

SEL7

SPC WW 111710

ALZ000-GAZ000-TNZ000-112300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 17

NWS STORM PREDICTION CENTER NORMAN OK

1210 PM EST WED FEB 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       NORTHWEST GEORGIA

       SOUTHEAST TENNESSEE



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1210 PM UNTIL

600 PM EST.



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 40 MILES NORTHWEST OF

CHATTANOOGA TENNESSEE TO 55 MILES SOUTH SOUTHEAST OF BIRMINGHAM

ALABAMA.  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 16...



DISCUSSION...LINE OF CONVECTION CONTINUES TO INTENSIFY OVER MIDDLE

TN...EXTENDING INTO EASTERN AL.  THREAT FOR LOCALLY DAMAGING WINDS

IS EXPECTED TO DEVELOP THROUGH THE AFTERNOON AS 120+ KNOT MID LEVEL

JET MAX SURGES INTO REGION.  LOW LEVEL VERTICAL SHEAR PROFILES ARE

ALSO QUITE FAVORABLE FOR BOW/LEWPS ALONG THE LINE...AND PERHAPS

ISOLATED CELLS AHEAD OF THE LINE...CAPABLE OF ISOLATED 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 400.

MEAN STORM MOTION VECTOR 25040.





...HART

