Storm Prediction Center Mesoscale Discussion 339

   Mesoscale Discussion 0339
   NWS Storm Prediction Center Norman OK
   0703 PM CDT Thu Apr 02 2026

   Areas affected...south-central Lower Michigan

   Concerning...Tornado Watch 90...

   Valid 030003Z - 030100Z

   The severe weather threat for Tornado Watch 90 continues.

   SUMMARY...The threat for an isolated tornado or two continues across
   the eastern portions of Tornado Watch 90.

   DISCUSSION...A series of supercells have been observed across
   portions of southwestern/south-central Lower Michigan over the last
   1-2 hours. While these storms have quickly moved north in the
   vicinity of a surface warm front due to deep-layer flow orientation,
   periods of enhanced rotation have been noted with these cells in
   close proximity to the surface boundary. Latest mesoanalysis depicts
   weak buoyancy (250-500 J/kg MLCAPE) along and south of this
   boundary. Despite this weak instability, clockwise-curved low-level
   hodographs and 200-300 m2/s2 0-500 m SRH (per the IWX VWP) will
   continue to support supercell structures capable of an isolated
   tornado or two for another hour or so, especially in close proximity
   to the surface warm front. With time, increasing low-level stability
   owing to nocturnal cooling should act to reduce the severe threat.

   ..Chalmers.. 04/03/2026

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

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

   LAT...LON   42538536 42588515 42478474 42338454 42128453 41978468
               41938491 41958523 42108551 42328548 42538536 

   MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH