Storm Prediction Center Mesoscale Discussion 1879

   Mesoscale Discussion 1879
   NWS Storm Prediction Center Norman OK
   0157 PM CDT Sun Aug 09 2026

   Areas affected...Southwestern Lower Michigan into far northern
   Indiana

   Concerning...Severe Thunderstorm Watch 546...547...

   Valid 091857Z - 092030Z

   The severe weather threat for Severe Thunderstorm Watch 546, 547
   continues.

   SUMMARY...Wind damage potential will increase along the
   southern/eastern Lake Michigan shore over the next 1-2 hours.

   DISCUSSION...A linear segment is nearing the eastern Lake Michigan
   shoreline. The most prominent feature within this line is a small
   mesovortex west of Ottawa County Michigan. While this feature may
   locally enhance wind damage potential, the airmass ahead of it has
   struggled to destabilize this afternoon owing to cloud cover.
   Temperatures far southwest Lower Michigan and northern Indiana are
   warmer. These locations should have a locally greater wind damage
   threat given the steeper low-level lapse rates and larger overall
   buoyancy. Further extensions in area/time of WW 546 may be needed
   into northwest Indiana given current convective trends.

   ..Wendt.. 08/09/2026

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

   ATTN...WFO...IWX...GRR...LOT...

   LAT...LON   41468706 41548807 41838839 42188763 42248736 42708680
               42978659 42888558 42198559 41698592 41498643 41468706 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH