<pre>ACUS11 KWNS 181240
SWOMCD
Mesoscale Discussion 1787
NWS Storm Prediction Center Norman OK
0740 AM CDT Sun Aug 18 2019
Areas affected...southeast Wisconsin...northeast
Illinois...northwest Indiana...and southwest Michigan
Concerning...Severe Thunderstorm Watch 597...
Valid 181240Z - 181445Z
The severe weather threat for Severe Thunderstorm Watch 597
continues.
SUMMARY...Thunderstorms continue this morning across the region.
Moderate instability and sufficient shear should continue to support
a severe threat this morning.
DISCUSSION...Initial line of thunderstorms has weakened considerably
this morning as increasing precipitation ahead of the line --
stemming from thunderstorms that developed south-southwest of
Chicago -- has acted to stabilize the airmass across north-central
Illinois and southern Wisconsin. The strongest thunderstorm cluster
from this original band of storms is currently located across
southeast Wisconsin and will have the potential to pose a severe
threat for another couple hours before moving east over Lake
Michigan.
As previously mentioned, additional thunderstorms developed to the
south-southwest of Chicago, ahead of the original line of storms.
These thunderstorms are within a better severe thunderstorm
environment than those to the north given less convective coverage
allowing most-unstable CAPE values to approach 2000 J/kg, and thus
have a greater potential to pose a severe wind or hail threat. At
present, these storms will move across the greater Chicago metro
over the next 1-2 hours, with hail and wind threats likely. These
storms will continue east-northeast through the morning, eventually
moving over Lake Michigan.
..Marsh.. 08/18/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DTX...IWX...GRR...LOT...ILX...MKX...DVN...
LAT...LON 41049091 41209108 41419104 41449078 41599076 41599087
42029080 42069013 42489062 42508982 43228976 43318965
43308901 43208900 43188789 43358783 43408645 43468638
43458608 43288607 43298559 43408553 43438437 42808436
42778417 42068412 42058483 41528482 41538517 40998536
40968558 41048583 40928619 40908692 40738713 40728752
40988754 40998824 41098827 41088891 40908890 40928904
41078907 41098930 41138931 41128957 41228965 41228981
41118988 41149040 41049043 41049091 </pre>
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