MESOSCALE DISCUSSION 1197
   NWS STORM PREDICTION CENTER NORMAN OK
   0556 PM CDT FRI JUN 11 2004
   
   AREAS AFFECTED...FAR SRN WI/NRN IL
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 112256Z - 120030Z
   
   POTENTIAL FOR TORNADIC SUPERCELLS APPEARS TO BE INCREASING ACROSS
   AREA AND A WW MAY BE REQUIRED.
   
   AS OF 2247Z...REGIONAL RADAR MOSAIC INDICATED TSTMS DEVELOPING OVER
   STEPHENSON AND JO DAVIESS COUNTIES IN FAR NWRN IL AS WELL AS
   LAFAYETTE COUNTY IN FAR SWRN WI. LATEST MESOANALYSIS SUGGESTS THAT
   THESE STORMS ARE DEVELOPING INVOF WARM FRONT WHICH EXTENDED FROM N
   OF DBQ TO NEAR RFD TO SW OF CGX. LOCAL DEWPOINTS OF 70-75F AND
   TEMPERATURES IN THE 80S ARE CONTRIBUTING TO MODERATE INSTABILITY
   ALONG AND JUST TO THE N OF WARM FRONT WITH MLCAPES OF 1500-2500
   J/KG. MOREOVER...BACKED NEAR SURFACE WINDS COUPLED WITH 30-35KT SWLY
   MID-LEVEL FLOW IS RESULTING IN SUFFICIENT DEEP-LAYER SHEAR FOR
   SUPERCELLS WITH LARGE HAIL. GREATEST TORNADO THREAT WILL EXIST ALONG
   AND JUST N OF RETREATING WARM FRONT WHERE 0-1KM SRH VALUES OF
   100-200 M2/S2 ARE CO-LOCATED WITH FAVORABLY LOW LCL HEIGHTS OF
   600-800M.
   
   A WW MAY BE REQUIRED SHORTLY.
   
   ..MEAD.. 06/11/2004
   
   
   ATTN...WFO...LOT...MKX...DVN...ARX...
   
   43109087 41579041 40548736 42228783