Alert archive / Illinois / Winter Storm Warnings in 2013

Winter Storm Warning 2, NWS Chicago, IL

February 26, 2013Lake County, McHenry County, Illinois

NWS Chicago, IL issued this winter storm warning at Feb 26, 2013, 5:12 PM CST for Lake County, McHenry County, Illinois. It was in force for 11 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: Feb 26, 2013, 5:12 PM CST (23:12 UTC)
Expired: Feb 27, 2013, 3:51 AM CST
In force: 11 hr
Issued by: NWS Chicago, IL

Counties Lake County, IL, McHenry County, IL

The radar

The Milwaukee radar (KMKX), 77 km from the middle of the area, began a volume at 23:12 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.2 hours before the alert went out and 238 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -84 m²/s²
0-3 km storm-relative helicity: -40 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 Feb 26, 4:17 PM CST, 55 minutes earlier.

Area forecast discussion, Feb 26, 4:17 PM CST, 55 minutes before

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Hazardous weather outlook, Feb 26, 4:34 PM CST, 38 minutes before

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In the hours before

Local storm report, Feb 26, 4:57 PM CST, 15 minutes before

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Local storm report, Feb 26, 5:02 PM CST, 10 minutes before

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Local storm report, Feb 26, 5:05 PM CST, 7 minutes before

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Local storm report, Feb 26, 5:07 PM CST, 5 minutes before

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Local storm report, Feb 26, 5:10 PM CST, 2 minutes before

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Local storm report, Feb 26, 5:11 PM CST, 1 minute 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
Feb 26, 2:30 AM CST	Winter Weather Advisory	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more	25 hr
Feb 26, 3:17 PM CST	Small Craft Advisory	LOT		5 days

Nearby

Winter Storm Warnings in Illinois, 2013 Every winter storm warning in 2013

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.