ACUS11 KWNS 182230
SWOMCD
SPC MCD 182229
WIZ000-ILZ000-IAZ000-190030-

Mesoscale Discussion 2029
NWS Storm Prediction Center Norman OK
0529 PM CDT Tue Aug 18 2026

Areas affected...northeast Iowa...southern Wisconsin...northern
Illinois

Concerning...Severe Thunderstorm Watch 595...

Valid 182229Z - 190030Z

The severe weather threat for Severe Thunderstorm Watch 595
continues.

SUMMARY...Severe threat continues within WW595.

DISCUSSION...Thunderstorms across southern Wisconsin have taken on a
more linear/bowing mode over the last hour. The line has produced a
few instances of damaging wind, with measured gusts up to 61 mph.
Deep layer flow is largely westerly, which will likely push the line
eastward across southern Wisconsin through the evening with damaging
wind becoming the main threat.

Watch issuance further south of WW595 remains uncertain. Deep layer
flow decreases further south, with mid-level cloud cover in place
and less instability. Additionally, lapse rate profiles are meager.
A couple of cells have developed further west across far eastern
Iowa. These may pose some potential for large hail in the short
term. It remains uncertain that coverage/duration will warrant
additional watch issuance at this time but this area will be
monitored.

..Thornton.. 08/18/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!4FFo7TeE8qjB2bErZn3DMLaYtkzb8MNphHJCH93sIIAnttUsSjLQiiQIgoQOsheO2_7CSzd4mU_LBvZetxcTl3H7ZFs$ for graphic product...

ATTN...WFO...GRB...LOT...MKX...DVN...ARX...

LAT...LON 43269158 43409092 43629034 43948929 43858813 43738786
43448767 43188765 42868775 42328788 42148831 41988888
41958956 42079019 42289090 42469136 42679166 42819174
43269158

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


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