Alert archive / Illinois / Mesoscale Discussions in 2020

Mesoscale Discussion 1886

December 29, 202011 counties in Illinois; 4 counties in Indiana; 6 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Dec 29, 2020, 3:52 PM CST for 11 counties in Illinois; 4 counties in Indiana; 6 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 29, 2020, 3:52 PM CST (21:52 UTC)
Expired: Dec 29, 2020, 7:45 PM CST
In force: 4 hr
Issued by: the Storm Prediction Center
Concerning: Heavy snow

All 21 counties

Cook County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, McHenry County, IL, Will County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Chicago radar (KLOT), 41 km from the middle of the area, began a volume at 21:52 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 29, 2:17 PM CST	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 7 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2020 Mesoscale Discussions in Wisconsin, 2020 Mesoscale Discussions in Indiana, 2020 Every mesoscale discussion in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.