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Tornado Watch 17
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WW0017 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL7
   
   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
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Page last modified: February 11, 2009
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