MESOSCALE DISCUSSION 0171
   NWS STORM PREDICTION CENTER NORMAN OK
   0939 PM CST TUE FEB 05 2008
   
   AREAS AFFECTED...MIDDLE TENNESSEE
   
   CONCERNING...TORNADO WATCH 40...
   
   VALID 060339Z - 060515Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 40 CONTINUES.
   
   AN ADDITIONAL WW PROBABLY WILL BE NEEDED SOUTH OF CURRENT WW SOON.
   
   FORCING SUPPORTING ONGOING CLUSTER OF TORNADIC SUPERCELLS...NEAR/
   NORTHWEST OF NASHVILLE...IS EXPECTED TO DEVELOP NORTHEAST OF MIDDLE
   TENNESSEE BY 04-05Z.  BUT...SEVERE THREAT WILL PERSIST UNTIL
   UPSTREAM SQUALL LINE ADVANCES THROUGH THE INTERSTATE 65 CORRIDOR
   DURING THE 06-08Z TIME FRAME.  THE RISK FOR DAMAGING WINDS MAY BE
   THE PRIMARY SEVERE THREAT WITH THE SQUALL LINE...BUT LOW-LEVEL SHEAR
   WILL REMAIN VERY STRONG AND SUPPORTIVE OF CONTINUING TORNADO
   POTENTIAL...AS THE BOUNDARY LAYER REMAINS RELATIVELY WARM/ MOIST AND
   POTENTIALLY BUOYANT.
   
   ..KERR.. 02/06/2008
   
   
   ATTN...WFO...MRX...OHX...BMX...HUN...MEG...
   
   35988819 36408787 36158654 35888576 35028564 34158609
   33548724 33498777 33898823