Alert archive / Illinois / Winter Storm Warnings in 2014

Winter Storm Warning 1, NWS Chicago, IL

January 4, 201412 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this winter storm warning at Jan 4, 2014, 3:57 AM CST for 12 counties in Illinois; 5 counties in Indiana. It took effect at Jan 4, 2014, 10:46 AM CST. It was in force for 37 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: Jan 4, 2014, 3:57 AM CST (09:57 UTC)
In effect from: Jan 4, 2014, 10:46 AM CST
Expired: Jan 6, 2014, 12:00 AM CST
In force: 37 hr
Issued by: NWS Chicago, IL

Counties DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 28 km from the middle of the area, began a volume at 10:00 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 00:00Z, 10.0 hours before the alert went out and 141 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: 1046 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 299 m²/s²
0-3 km storm-relative helicity: 365 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 Jan 4, 3:23 AM CST, 34 minutes earlier.

Area forecast discussion, Jan 4, 3:23 AM CST, 34 minutes before

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Hazardous weather outlook, Jan 3, 5:37 PM CST, 10 hours 20 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
Jan 4, 3:57 AM CST	Winter Weather Advisory	LOT	DuPage, Grundy, Kendall, LaSalle	7 hr
Jan 4, 9:22 AM CST	Small Craft Advisory	LOT		6 hr
Jan 4, 10:46 AM CST	Winter Weather Advisory	LOT	Boone, McHenry, Ogle, Winnebago	24 hr
Jan 4, 2:07 PM CST	Wind Chill Warning	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	70 hr
Jan 4, 3:09 PM CST	Gale Watch	LOT		12 hr
Jan 4, 3:09 PM CST	Small Craft Advisory	LOT		24 hr
Jan 4, 3:09 PM CST	Heavy Freezing Spray Watch	LOT		6 hr

Nearby

Winter Storm Warnings in Illinois, 2014 Winter Storm Warnings in Indiana, 2014 Every winter storm warning in 2014

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.