MESOSCALE DISCUSSION 1593
   NWS STORM PREDICTION CENTER NORMAN OK
   0953 PM CDT THU JUL 26 2007
   
   AREAS AFFECTED...SRN WI NRN IL
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 270253Z - 270430Z
   
   AN ISOLATED DAMAGING WIND AND HAIL THREAT IS EXPECTED TO CONTINUE
   TONIGHT SWD THROUGH SRN WI INTO NRN IL.  AN ADDITIONAL WW IS NOT
   ANTICIPATED.
   
   RECENT REGIONAL RADAR OBSERVATIONS INDICATE A SLIGHT WEAKENING TREND
   TO ONGOING MCS.  IMMEDIATE INFLOW AIR MASS ACROSS DISCUSSION AREA
   HAS COOLED INTO THE 70S WITH WEAKENING LOW-LEVEL LAPSE RATES. 
   STILL...FORCING FOR ASCENT ASSOCIATED WITH WEAK SHORT WAVE TROUGH
   TRANSLATING SEWD THROUGH NRN PORTIONS OF MN/WI COUPLED WITH BROAD
   LOW-LEVEL WAA REGIME IN PLACE ACROSS THE MIDWEST WILL LIKELY
   MAINTAIN SYSTEM INTO PARTS OF IL LATER TONIGHT.
   
   CURRENT MILWAUKEE AND CHICAGO VWPS INDICATE SUFFICIENT VERTICAL
   SHEAR FOR MCS ORGANIZATION...HOWEVER IT APPEARS THAT DECREASING
   LAPSE RATES AND CONVECTIVE INSTABILITY ARE POSSIBLY CONTRIBUTING TO
   THE WEAKENING OF SYSTEM.  NONETHELESS...SOME POTENTIAL FOR ISOLATED
   DAMAGING WINDS AND/OR HAIL WILL EXIST WITH ANY MORE INTENSE STORMS
   THAT CAN REGENERATE WITHIN LARGER CONVECTIVE SYSTEM.
   
   ..MEAD.. 07/27/2007
   
   
   ATTN...WFO...LOT...MKX...DVN...ARX...
   
   43169107 43409051 43478942 43368859 43068782 42488772
   42058786 41878861 41998938 42499055