SPC MESOSCALE DISCUSSION 0726 FOR SERN MN...SWRN WI...NERN IA... 
   CONCERNING...TORNADO WATCH #258...
   
   VALID 090036Z - 090400Z
   
   TORNADO WATCH #258 WILL CONTINUE TO BE IN EFFECT THRU 09/0400Z. 
   
   RECENT RADAR/SATELLITE TRENDS INDICATE SEVERAL SEVERE TSTMS MAINLY
   HEADED ENEWD /220-245 DEGREES/ FROM 25-45 MPH. MESOANALYSIS SHOWS
   SURFACE LOW JUST WEST OF RST WITH WARM FRONT RIGHT ALONG IA/WI
   BORDER REGION /MS RIVER/ INTO NRN IL. LARGE SUPERCELL PRESENTLY IN
   WINNESHIEK COUNTY IN NERN IA WILL BE MOVING ENEWD INTO ALLAMAKEE
   COUNTY...THIS STORM HAS ALREADY PRODUCED A TORNADO. LARGE HAIL IS
   ALSO A CONCERN WITH THIS SUPERCELL AS IT CONTINUES MOVING ENEWD.
   WARM FRONT IS DIRECTLY TO THE EAST OF THIS STORM...AND WITH BACKED
   LOW-LVL FLOW INDICATED FROM ARX(LACROSSE) 88-D VAD PROFILES...A
   TORNADO THREAT REMAINS IN THIS REGION. 
   
   21Z RUC40 SHOWS STRENGTHENING 850MB SLY LLJ FROM 30-40 KTS FROM NRN
   IL INTO NCNTRL WI OVER THE NEXT SEVERAL HOURS. WITH WARM FRONT
   LIKELY STAYING TO THE SOUTH...THE MAIN THREAT OF THE ACTIVITY
   SPREADING EWD INTO WISCONSIN WILL BE LARGE HAIL AS WELL AS A STRONG
   WIND THREAT. 
   
   ..NADEN.. 05/09/02