Update 6:45PM CDT…
Severe Thunderstorm Watch for the Chicago area has been cancelled.
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The National Storm Prediction Center has issued a Severe Thunderstorm Watch that includes much of the Chicago area until 10PM CDT this Tuesday afternoon/evening. The blue-shaded counties in the headlined map are included in the Watch. The main risk in these storms will be damaging winds with a possible tornado or two. The following Chicago area counties in Illinois are included in the Watch:
Boone, Cook, DeKalb, DuPage, Kane, Kendall, Lake, LaSalle, Lee, Livingston, McHenry, Ogle, Will, and Winnebago Counties.
Following is the official Watch description and discussion…
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Extreme east central and southeastern Iowa
Northern Illinois
Southeastern Wisconsin
Lake Michigan
* Effective this Tuesday afternoon and evening from 135 PM until
1000 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1 inch in diameter possible
A tornado or two possible
SUMMARY...Storms in eastern Iowa should continue to increase some in
coverage/intensity through the afternoon, as the storms spread into
Illinois and southern Wisconsin. Damaging winds will be the main
threat with embedded bowing segments. A mixed mode of line segments
and more discrete supercells is expected, and a tornado or two may
occur with the strongest embedded circulations.
The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 40 miles north
northwest of Burlington IA to 30 miles south southeast of Racine WI.
