Alert archive / Michigan / Mesoscale Discussions in 2020

Mesoscale Discussion 1889

December 30, 202010 counties in Illinois; 26 counties in Michigan; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Dec 30, 2020, 1:15 AM CST for 10 counties in Illinois; 26 counties in Michigan; 4 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 30, 2020, 1:15 AM CST (07:15 UTC)
Expired: Dec 30, 2020, 7:15 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center
Concerning: Winter mixed precipitation

All 40 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Livingston County, MI, Montcalm County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI

The radar

The Grand Rapids radar (KGRR), 52 km from the middle of the area, began a volume at 07:16 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, 7:50 PM CST	Mesoscale Discussion	SPC	Allegan, Barry, Branch, Calhoun, Cass, Clare and 33 more	4 hr

Nearby

Mesoscale Discussions in Michigan, 2020 Mesoscale Discussions in Illinois, 2020 Mesoscale Discussions in Wisconsin, 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.