MESOSCALE DISCUSSION 0737
   NWS STORM PREDICTION CENTER NORMAN OK
   0807 PM CDT MON MAY 20 2013
   
   AREAS AFFECTED...FAR W-CNTRL IL / CNTRL-SWRN MO
   
   CONCERNING...TORNADO WATCH 190...193...
   
   VALID 210107Z - 210130Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 190...193...CONTINUES.
   
   SUMMARY...DAMAGING WINDS ARE BECOMING THE PREDOMINATE THREAT AS
   STORMS CONTINUE TO GROW UPSCALE INTO A QLCS.  A TORNADO REMAINS
   POSSIBLE WITH ANY STRONGER/LONGER-LIVED EMBEDDED MESOCYCLONE OR
   MESOVORTEX.
   
   DISCUSSION...RADAR MOSAIC SHOWS STORMS CONGEALING INTO A QLCS DURING
   THE PAST HOUR AS CONVECTIVE MERGERS AND DIFFERENTIAL STORM MOTIONS
   ACT TO FAVOR UPSCALE GROWTH.  THE 00Z/20 SGF RAOB EXHIBITED A VERY
   MOIST BOUNDARY LAYER CONTRIBUTING TO MODERATE INSTABILITY /2400 J/KG
   MLCAPE/ AND AN INCREASING/VEERING WIND PROFILE WITH HEIGHT.  STORMS
   THAT CAN ORIENT PERPENDICULAR TO THE FLOW IN THE LOWEST 0-3 KM WILL
   POSE AN ENHANCED THREAT FOR WIND DAMAGE.
   
   ..SMITH.. 05/21/2013
   
   
   ATTN...WFO...ILX...LSX...LZK...SGF...
   
   LAT...LON   37439314 39959133 39779059 39399040 36979226 36479308
               36669367 37439314