SPC MD 991
MD 0991 CONCERNING SEVERE THUNDERSTORM WATCH 274... FOR PARTS OF CENTRAL/NORTHERN WI AND SOUTHERN UPPER MI

Mesoscale Discussion 0991
NWS Storm Prediction Center Norman OK
0524 PM CDT Fri Jun 05 2026

Areas affected...Parts of central/northern WI and southern Upper MI

Concerning...Severe Thunderstorm Watch 274...

Valid 052224Z - 060030Z

The severe weather threat for Severe Thunderstorm Watch 274
continues.

SUMMARY...A threat for locally damaging wind and isolated hail may
spread east-southeastward into the early evening.

DISCUSSION...A cluster of occasionally strong storms is ongoing at
2215 UTC across parts of northwest WI. MLCAPE of 1000-1500 J/kg and
effective shear of 30-35 kt are marginally supportive of organized
convection, though relatively weak midlevel lapse rates and
low-level flow have hindered potential for a more substantial severe
threat thus far. With time, expanding outflow within a steep
low-level lapse rate environment could support an increasing threat
for damaging wind as convection moves east-southeastward, and
isolated hail cannot be ruled out with the strongest embedded
updrafts. 

An isolated severe threat will spread to the north and east of WW
274 into early evening. The need for a new watch is uncertain given
current trends, but these storms will be monitored for an uptick in
storm organization through 00 UTC.

..Dean/Gleason.. 06/05/2026

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

ATTN...WFO...MQT...GRB...MKX...DLH...ARX...MPX...

LAT...LON   46128990 46298865 46198805 46088782 45938764 45808757
            45438765 45238772 45148777 44638820 43888891 43718978
            43929106 44179168 44419196 44599232 44819138 45409040
            46128990 

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

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https://www.spc.noaa.gov/products/md/md0991.html