Alert archive / Illinois / Wind Chill Advisories in 2011

Wind Chill Advisory 4, NWS Chicago, IL

February 9, 201116 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this wind chill advisory at Feb 9, 2011, 3:09 PM CST for 16 counties in Illinois; 5 counties in Indiana. It took effect at Feb 9, 2011, 8:09 PM CST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Feb 9, 2011, 3:09 PM CST (21:09 UTC)
In effect from: Feb 9, 2011, 8:09 PM CST
Expired: Feb 10, 2011, 10:01 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 21:15 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 156 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: 2090 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 84 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 Feb 9, 3:07 PM CST, 2 minutes earlier.

Area forecast discussion, Feb 9, 3:07 PM CST, 2 minutes before

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Hazardous weather outlook, Feb 9, 8:45 AM CST, 6 hours 24 minutes before

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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.