ACUS11 KWNS 271231
SWOMCD
SPC MCD 271230
MIZ000-WIZ000-271430-

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 https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!92GHZ7fBGtuOscaee8r22J5j-1-LpMLs-S5zgIn0-fQGLvr7EpuSdH3ekdj_IpXE8_vrIkndB-q7obvKBIXNkmMKNqY$ 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


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