MESOSCALE DISCUSSION 1200
   NWS STORM PREDICTION CENTER NORMAN OK
   0757 PM CDT FRI JUN 11 2004
   
   AREAS AFFECTED...CNTRL/SRN MN/NRN IA INTO WRN WI
   
   CONCERNING...TORNADO WATCH 438...
   
   VALID 120057Z - 120230Z
   
   GREATEST POTENTIAL FOR ISOLATED TORNADOES REMAINS ACROSS SRN
   PORTIONS OF WW 438.
   
   AS OF 0038Z...REGIONAL RADAR MOSAIC INDICATED LEADING EDGE OF
   EVOLVING MCS FROM BARRON/POLK COUNTIES IN W-CNTRL WI SWD THROUGH
   FILLMORE COUNTY MN AND INTO WEBSTER COUNTY IA. THE ANCHOR STORM OVER
   WEBSTER COUNTY IS EXHIBITING STRONG MID-LEVEL ROTATION AS IS A STORM
   OVER OLMSTED COUNTY IN FAR SERN MN...WHERE CONVECTIVE LINE IS
   INTERSECTING WARM FRONT. AIRMASS AHEAD OF PRESSURE TROUGH OVER WRN
   IA AND S OF WARM FRONT /EXTENDING FROM S OF RST TO E OF DBQ/ REMAINS
   MODERATELY TO STRONGLY UNSTABLE THIS EVENING WITH MLCAPES OF
   2000-3000 J/KG.
   
   WHILE LFC/LCL HEIGHTS REMAIN FAVORABLY LOW ACROSS MUCH OF WARM
   SECTOR AIRMASS...OBJECTIVE ANALYSIS FIELDS INDICATE THE STRONGEST
   LOW-LEVEL SHEAR INVOF WARM FRONT OVER NERN IA. THUS...ISOLATED
   TORNADOES REMAIN POSSIBLE WITH ONGOING SUPERCELL OVER WEBSTER
   COUNTY...AS WELL AS ANY STORMS THAT CAN REALIZE ENHANCED LOW-LEVEL
   BUOYANCY/SHEAR ALONG/N OF WARM FRONT.
   
   FARTHER N...00Z MPX SOUNDING INDICATED STABLE NEAR GROUND LAYER WITH
   WEAKLY UNSTABLE AIRMASS FOR ELEVATED PARCELS. EXPECT STRONGEST
   STORMS TO POSE MAINLY A LARGE HAIL THREAT AS THEY PROGRESS EWD
   ACROSS W-CNTRL INTO CNTRL WI. CONVECTIVE TRENDS WILL CONTINUE TO BE
   MONITORED AND A NEW WW MAY BE REQUIRED E OF WW 438
   
   ..MEAD.. 06/12/2004
   
   
   ATTN...WFO...GRB...MKX...DVN...DLH...ARX...MPX...DMX...FGF...FSD...ABR...
   
   45799649 45789001 43188947 43189094 42269060 42249490