<pre>ACUS11 KWNS 262039
SWOMCD
Mesoscale Discussion 1008
NWS Storm Prediction Center Norman OK
0339 PM CDT Fri Jun 26 2020
Areas affected...Southern Wisconsin...northern Illinois...northeast
Iowa
Concerning...Severe Thunderstorm Watch 305...
Valid 262039Z - 262245Z
The severe weather threat for Severe Thunderstorm Watch 305
continues.
SUMMARY...The environment ahead of storm cluster in western WI has
gradually become more supportive of severe convection. Damaging wind
gusts will be the primary threat with isolated large hail possible
with any marginal supercells that can develop. The tornado threat
remains low with northeastern IL and adjacent southern WI exhibiting
the more favorable environment.
DISCUSSION...A recent increase in intensity has occurred with a
cluster of storms now in Grant County, WI. This has occurred as
temperatures have slowly warmed into the mid to upper 70s F to the
north of the outflow boundary across northern IL. With storms
beginning to congeal in western WI and a modestly improving airmass
downstream, storms should pose an increasing threat for mainly
damaging microbursts and perhaps isolated large hail. Should the
southern flank of the southwestern WI cluster develop southward,
that activity would pose the greatest severe risk given the more
buoyant airmass to the south. Along the outflow boundary itself,
development is also possible, though less certain, given the weak
MLCIN sampled by the 20Z DVN sounding. The tornado threat is still
anticipated to be low, but the most supportive environment exists
within northeastern IL and adjacent southern WI given the more
backed surface winds.
..Wendt.. 06/26/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LOT...MKX...DVN...ARX...
LAT...LON 43309067 43468952 42888783 41958769 41378790 41188891
41279020 41699120 42799145 43309067 </pre>
https://wxn.io/fOvvQ
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