ACUS11 KWNS 091857
SWOMCD
SPC MCD 091857
MIZ000-INZ000-ILZ000-092030-

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 https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!_JC_uce5k4LDYl2KwYK4kOfDTECfTz8GmMqpjYypCEAdptnYN9U1-w-YB_-ZkkRmUOAiiprq8Azi_OY1Q3A7hyqHzSs$ 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


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--- scorpsmtpd
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