MESOSCALE DISCUSSION 1300
   NWS STORM PREDICTION CENTER NORMAN OK
   0430 PM CDT SUN JUN 19 2011
   
   AREAS AFFECTED...WRN/CNTRL KY...WRN/MIDDLE TN
   
   CONCERNING...TORNADO WATCH 511...
   
   VALID 192130Z - 192200Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 511 CONTINUES.
   
   AN ISOLATED STRONG TO SEVERE TSTM HAS DEVELOPED UPSTREAM OF WW 511
   ALONG THE CONFLUENCE OF THE MS/OH RIVERS. ALTHOUGH THIS HAS OCCURRED
   IN THE WAKE OF A SHORT WAVE TROUGH OVER THE CNTRL OH VALLEY...AN
   APPARENT WEAK IMPULSE MAY BE TRACKING ACROSS THE MID-MS/LOWER OH
   VALLEY...SUPPORTING THIS RENEWED DEVELOPMENT. ADDITIONAL TCU REMAIN
   NOTED EWD ALONG OUTFLOW BOUNDARY EXTENDING ALONG THE KY/TN BORDER.
   GIVEN PRESENCE OF STRONG INSTABILITY S OF THE BOUNDARY AND
   SUFFICIENT WLY MID-LEVEL FLOW FOR SUPERCELLS...A NEW WW OR
   REPLACEMENT OF WW 511 MAY BE NEEDED SOON.
   
   ..GRAMS.. 06/19/2011
   
   
   ATTN...WFO...MRX...JKL...LMK...OHX...PAH...MEG...
   
   LAT...LON   37038933 37408913 37288790 37138601 37068475 36638408
               36168429 35988577 36328794 36748949 37038933