MESOSCALE DISCUSSION 1185
   NWS STORM PREDICTION CENTER NORMAN OK
   0737 PM CDT WED JUN 17 2009
   
   AREAS AFFECTED...PARTS OF MIDDLE TN / WRN KY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 444...
   
   VALID 180037Z - 180130Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 444
   CONTINUES.
   
   ISOLD TORNADO POTENTIAL...IN ADDITION TO A LARGE HAIL THREAT...MAY
   PERSIST FOR THE NEXT HOUR OR TWO...MAINLY ACROSS PARTS OF THE
   NASHVILLE METRO AND AREAS IMMEDIATELY NW INTO MONTGOMERY COUNTY.
   
   RADAR MOSAIC IMAGERY INDICATES A POSSIBLE/DIFFUSE OUTFLOW BOUNDARY
   INTERSECTING NWWD INTO THE ONGOING SUPERCELLS IN NRN MIDDLE TN.  00Z
   BNA RAOB DENOTED A VERY MOIST LOW LEVEL ENVIRONMENT WITH LCL/S AOB
   1000 M...AND SURFACE TO H5 LAPSE RATES NEAR 7 DEG C / KM.  DESPITE
   GENERALLY WLY LOW LEVEL FLOW VEERING TO STRONG NWLY ALOFT...BACKING
   OF LOW LEVEL WINDS ON THE IMMEDIATE COOL SIDE OF THE OUTFLOW
   BOUNDARY INTO STORM UPDRAFTS MAY SUPPORT AN ISOLD TORNADO RISK. 
   THIS WILL PROBABLY CONTINUE AS STORMS PROPAGATE ALONG AFOREMENTIONED
   BOUNDARY INGESTING VERY/EXTREMELY UNSTABLE INFLOW AIRMASS.
   
   ..SMITH.. 06/18/2009
   
   
   ATTN...WFO...LMK...OHX...PAH...
   
   LAT...LON   35628645 36248734 36878767 37068762 36988720 36408633
               35988606 35658607 35628645