Alert archive / Illinois / Mesoscale Discussions in 2020

Mesoscale Discussion 1785

November 10, 20208 counties in Illinois; Lake County, Indiana; Kenosha County, Racine County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Nov 10, 2020, 5:03 PM CST for 8 counties in Illinois; Lake County, Indiana; Kenosha County, Racine County, Wisconsin. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Nov 10, 2020, 5:03 PM CST (23:03 UTC)
Expired: Nov 10, 2020, 6:00 PM CST
In force: 57 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 505

Counties Cook County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Lake County, IL, Livingston County, IL, Will County, IL, Lake County, IN, Kenosha County, WI, Racine County, WI

The radar

The Chicago radar (KLOT), 17 km from the middle of the area, began a volume at 23:02 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.1 hours before the alert went out and 180 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 14 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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
Nov 10, 8:52 AM CST	Mesoscale Discussion	SPC	Adams, Brown, Cass, Fulton, Hancock, McDonough and 2 more	113 min
Nov 10, 11:22 AM CST	Severe Thunderstorm Watch	SPC	Adams, Brown, Bureau, Calhoun, Carroll, Cass and 29 more	7 hr
Nov 10, 1:28 PM CST	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	92 min
Nov 10, 1:48 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Carroll, Cass and 34 more	87 min
Nov 10, 2:05 PM CST	Tornado Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 25 more	6 hr
Nov 10, 3:30 PM CST	Mesoscale Discussion	SPC	Boone, Lee, McHenry, Ogle, Winnebago	2 hr
Nov 10, 5:01 PM CST	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 26 more	119 min
Nov 10, 9:19 AM CST	Mesoscale Discussion	SPC	Barron, Dunn, Pierce, Rusk, Saint Croix, Sawyer	5 hr
Nov 10, 3:51 PM CST	Mesoscale Discussion	SPC	Burnett, Polk, Saint Croix	6 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.