Storm Prediction Center Mesoscale Discussion 994

   Mesoscale Discussion 0994
   NWS Storm Prediction Center Norman OK
   0918 PM CDT Fri Jun 05 2026

   Areas affected...Parts of southern/eastern WI and adjacent parts of
   southeast MN/northeast IA

   Concerning...Severe Thunderstorm Watch 274...

   Valid 060218Z - 060345Z

   The severe weather threat for Severe Thunderstorm Watch 274
   continues.

   SUMMARY...An isolated severe threat may continue into late evening,
   before an eventual weakening trend.

   DISCUSSION...A large storm cluster is moving southeastward across
   central WI this evening. While the environment remains somewhat
   favorable, with MLCAPE of greater than 1500 J/kg and 30-40 kt of
   effective shear, much of the convection has been undercut by
   outflow. Small line segments to the east of La Crosse and south of
   Green Bay have taken on a more favorable north-south orientation,
   and may pose a localized damaging-wind threat for as long as they
   keep pace with the outflow. Additionally, a small supercell has
   developed ahead of the storm cluster, to the southwest of Oshkosh.
   With 0-1 km SRH of 100-200 m2/s2 (per objective mesoanalysis and the
   KMKE VWP), this cell may pose some tornado potential for as long as
   it persists.

   With the onset of nocturnal cooling/stabilization, a general
   weakening trend is expected with time later this evening, and
   additional watch issuance is considered unlikely.

   ..Dean/Gleason.. 06/06/2026

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...GRB...MKX...ARX...

   LAT...LON   44529194 44079095 43968966 44118879 44398832 44658815
               44778793 44708753 43588752 43268776 42958854 42939062
               43299168 43899225 44529194 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN