Alert archive / Illinois / Wind Chill Advisories in 2014

Wind Chill Advisory 2, NWS Chicago, IL

January 20, 20149 counties in Illinois

NWS Chicago, IL issued this wind chill advisory at Jan 20, 2014, 3:58 AM CST for 9 counties in Illinois. It took effect at Jan 21, 2014, 3:00 AM CST. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jan 20, 2014, 3:58 AM CST (09:58 UTC)
In effect from: Jan 21, 2014, 3:00 AM CST
Expired: Jan 21, 2014, 10:00 AM CST
In force: 7 hr
Issued by: NWS Chicago, IL

Counties Boone County, IL, DeKalb County, IL, Kane County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 75 km from the middle of the area, began a volume at 09:59 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

Davenport, (KDVN), launched 00:00Z, 10.0 hours before the alert went out and 150 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: 1613 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 421 m²/s²
0-3 km storm-relative helicity: 420 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 20, 3:47 AM CST, 11 minutes earlier.

Area forecast discussion, Jan 20, 3:47 AM CST, 11 minutes before

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Hazardous weather outlook, Jan 19, 9:55 PM CST, 6 hours 3 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 20, 3:22 AM CST	Small Craft Advisory	LOT		42 hr
Jan 20, 12:47 PM CST	Lake Effect Snow Warning	LOT		28 hr
Jan 20, 12:47 PM CST	Lake Effect Snow Advisory	LOT	Lake	32 hr

Nearby

Wind Chill Advisories in Illinois, 2014 Every wind chill advisory 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.