Storm Prediction Center Mesoscale Discussion 1758

   Mesoscale Discussion 1758
   NWS Storm Prediction Center Norman OK
   0730 AM CDT Mon Jul 27 2026

   Areas affected...Western Upper Peninsula of Michigan...Northern
   Wisconsin

   Concerning...Severe Thunderstorm Watch 518...

   Valid 271230Z - 271430Z

   The severe weather threat for Severe Thunderstorm Watch 518
   continues.

   SUMMARY...Some intensification of activity over Lake
   Superior/western Upper Peninsula of Michigan is possible as it moves
   southeast. Large hail and damaging winds remain possible into
   mid/late morning.

   DISCUSSION...Activity over Lake Superior has tended to take a more
   southward motion over the last hour. A very unstable, but currently
   capped, airmass is situated in northwest Wisconsin. Continued
   surface heating may allow low-level cloud cover to abate by late
   morning/early afternoon. Some intensification of ongoing storms is
   possible as this process occurs. Large hail and damaging winds would
   be the main hazards. Depending on the timing/track of these storms,
   some extension in time/area of WW 518 may be needed later this
   morning.

   ..Wendt.. 07/27/2026

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

   ATTN...WFO...MQT...GRB...DLH...

   LAT...LON   47009109 47419087 47508983 46518820 45828766 45468793
               45408918 47009109 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN