Alert archive / Illinois / Winter Storm Warnings in 2015

Winter Storm Warning 7, NWS Chicago, IL

December 28, 2015DuPage County, Grundy County, Kankakee County, Illinois; Lake County, Porter County, Indiana

NWS Chicago, IL issued this winter storm warning at Dec 28, 2015, 3:09 PM CST for DuPage County, Grundy County, Kankakee County, Illinois; Lake County, Porter County, Indiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 28, 2015, 3:09 PM CST (21:09 UTC)
Expired: Dec 28, 2015, 6:00 PM CST
In force: 3 hr
Issued by: NWS Chicago, IL

Counties DuPage County, IL, Grundy County, IL, Kankakee County, IL, Lake County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 32 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 161 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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 654 m²/s²
0-3 km storm-relative helicity: 1003 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this winter storm warning went out at Dec 28, 2:03 PM CST, 1 hour 6 minutes earlier.

Area forecast discussion, Dec 28, 2:03 PM CST, 1 hour 6 minutes before

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Hazardous weather outlook, Dec 28, 10:52 AM CST, 4 hours 17 minutes before

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In the hours before

Local storm report, Dec 28, 2:05 PM CST, 1 hour 4 minutes before

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Local storm report, Dec 28, 2:15 PM CST, 54 minutes before

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Local storm report, Dec 28, 2:47 PM CST, 22 minutes before

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Local storm report, Dec 28, 2:59 PM CST, 10 minutes before

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Local storm report, Dec 28, 3:01 PM CST, 8 minutes before

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Local storm report, Dec 28, 3:07 PM CST, 2 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 27, 8:14 PM CST	River Flood Warning	LOT	Livingston	4 days
Dec 28, 9:15 AM CST	River Flood Advisory	LOT	Ogle	5 days
Dec 28, 10:23 AM CST	River Flood Advisory	LOT	Cook	36 hr
Dec 28, 11:34 AM CST	River Flood Warning	LOT	Grundy	49 hr
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Lake	3 days
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Cook	4 days
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Cook	3 days
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Kankakee	66 hr
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Will	3 days
Dec 28, 12:08 PM CST	Freezing Rain Advisory	LOT	Ford, Iroquois	3 hr
Dec 28, 4:01 PM CST	Gale Warning	LOT		17 hr
Dec 28, 5:27 PM CST	Areal Flood Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	12 hr
Dec 28, 11:49 AM CST	River Flood Advisory	LOT	Jasper	56 hr

Nearby

Winter Storm Warnings in Illinois, 2015 Winter Storm Warnings in Indiana, 2015 Every winter storm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.