Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 1990

November 21, 201530 counties in Illinois; Walworth County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Nov 21, 2015, 6:32 AM CST for 30 counties in Illinois; Walworth County, Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Nov 21, 2015, 6:32 AM CST (12:32 UTC)
Expired: Nov 21, 2015, 10:30 AM CST
In force: 4 hr
Issued by: the Storm Prediction Center

All 31 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Walworth County, WI

The radar

The Chicago radar (KLOT), 101 km from the middle of the area, began a volume at 12:37 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, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 20, 7:33 PM CST	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson, Winnebago	4 hr
Nov 21, 6:28 AM CST	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more	4 hr

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Wisconsin, 2015 Every mesoscale discussion in 2015

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.