MESOSCALE DISCUSSION 0993
   NWS STORM PREDICTION CENTER NORMAN OK
   0353 PM CDT MON JUN 08 2009
   
   AREAS AFFECTED...SOUTHEAST WI/NORTHERN IL/NORTHWEST INDIANA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 350...
   
   VALID 082053Z - 082200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 350
   CONTINUES.
   
   SEVERE TSTM WATCH 350 CONTINUES UNTIL 00Z ACROSS PORTIONS OF
   SOUTHEAST WI AND NORTHERN IL.
   
   ORGANIZING QUASI-LINEAR COMPLEX WITH AN EMBEDDED NORTH-SIDE
   SUPERCELL CONTINUES TO STEADILY PROGRESS EASTWARD AT AROUND 35 KT
   ACROSS FAR SOUTHEAST WI AND FAR NORTHEAST IL. A DISTINCT SHORT TERM
   SEVERE WIND/HAIL THREAT WILL CONTINUE TO SPREAD EAST-SOUTHEASTWARD
   TOWARD THE I-94 CORRIDOR FROM MILWAUKEE SOUTHWARD TO PERHAPS
   WAUKEGAN IL IN THE SHORT TERM. GIVEN THE PROXIMITY OF THE WARM FRONT
   AND AMBIENT LOW LEVEL VORTICITY/AMPLE LOW LEVEL CAPE...AN ISOLATED
   TORNADO CANNOT BE RULED OUT. ADDITIONAL DEVELOPMENT MAY CONTINUE TO
   OCCUR ON THE SOUTHERN PERIPHERY OF THE EXISTING SMALL SCALE MCS INTO
   NORTHERN IL. BUT OTHERWISE...THE LIKLIHOOD/EXTENT OF ADDITIONAL
   DEVELOPMENT IS UNCERTAIN FARTHER SOUTHWEST ACROSS NORTHERN IL. LOW
   LEVEL CONVERGENCE IS TENDING TO WEAKEN WITH TIME IN THE WAKE OF MID
   LEVEL SHORTWAVE TROUGH...BUT WEAK SURFACE BASED CINH/MULTIPLE
   DEEPENING BANDS OF CU SUGGEST AT LEAST ISOLATED ADDITIONAL
   DEVELOPMENT ACROSS NORTH CENTRAL IL MAY POSE A HAIL/WIND RISK
   THROUGH LATE AFTERNOON.
   
   ..GUYER.. 06/08/2009
   
   
   ATTN...WFO...IWX...LOT...ILX...MKX...DVN...
   
   LAT...LON   42878876 43068698 42138660 41168667 40688749 40518967
               42878876