MESOSCALE DISCUSSION 0099
   NWS STORM PREDICTION CENTER NORMAN OK
   1002 AM CST WED FEB 11 2009
   
   AREAS AFFECTED...TN VALLEY REGION
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 111602Z - 111730Z
   
   THREAT FOR DAMAGING WINDS IS FORECAST TO SLOWLY INCREASE THIS
   AFTERNOON...AHEAD OF QUICKLY-MOVING CONVECTIVE LINE.  WW MAY
   EVENTUALLY BE REQUIRED.
   
   LATEST RADAR SHOWS A FAIRLY WELL-DEFINED BUT LOW-TOPPED LINE OF
   CONVECTION MOVING QUICKLY EWD ACROSS WRN KY/WRN TN/NERN MS.  MORNING
   SOUNDINGS REVEAL LITTLE IF ANY INSTABILITY...WITH THE CONVECTIVE
   LINE SUSTAINED PRIMARILY BY STRONG FORCING ALONG THE SURFACE FRONT.
   
   AS THE UPPER SYSTEM NOW CROSSING THE OZARKS TAKES ON AN
   INCREASINGLY-NEGATIVE TILT...THE SURFACE FRONT -- AND ASSOCIATED
   CONVECTIVE LINE -- SHOULD ACCELERATE EWD.  WITH VERY STRONG
   DEEP-LAYER WIND FIELD ACROSS THIS REGION...EVEN SLIGHT
   INTENSIFICATION OF THE CONVECTIVE LINE WILL INCREASE THE LIKELIHOOD
   OF TRANSPORTING STRONGER WINDS TO THE SURFACE.
   
   ..GOSS.. 02/11/2009
   
   
   ATTN...WFO...RLX...GSP...MRX...JKL...FFC...ILN...LMK...OHX...
   BMX...HUN...PAH...
   
   LAT...LON   33888745 34448768 35838741 37048735 38498619 38908490
               38828390 38418307 37528281 36268317 34898414 34158596
               33888745