Alert archive / Illinois / Wind Chill Advisories in 2011

Wind Chill Advisory 1, NWS Chicago, IL

January 19, 201116 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this wind chill advisory at Jan 19, 2011, 2:50 PM CST for 16 counties in Illinois; 5 counties in Indiana. It took effect at Jan 20, 2011, 9:00 PM CST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jan 19, 2011, 2:50 PM CST (20:50 UTC)
In effect from: Jan 20, 2011, 9:00 PM CST
Expired: Jan 21, 2011, 11:00 AM CST
In force: 14 hr
Issued by: NWS Chicago, IL

All 21 counties

Boone County, IL, 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, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 15 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 329 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: 898 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 23 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 wind chill advisory 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 wind chill advisory went out at Jan 19, 2:45 PM CST, 5 minutes earlier.

Area forecast discussion, Jan 19, 2:45 PM CST, 5 minutes before

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Hazardous weather outlook, Jan 19, 4:14 AM CST, 10 hours 36 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 19, 2:45 PM CST	Gale Watch	LOT		12 hr

Nearby

Wind Chill Advisories in Illinois, 2011 Wind Chill Advisories in Indiana, 2011 Every wind chill advisory in 2011

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.