Alert archive / Illinois / Winter Storm Warnings in 2008

Winter Storm Warning 4, NWS Chicago, IL

February 25, 200816 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this winter storm warning at Feb 25, 2008, 3:45 AM CST for 16 counties in Illinois; 5 counties in Indiana. It took effect at Feb 25, 2008, 4:00 PM CST. It was in force for 12 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 25, 2008, 3:45 AM CST (09:45 UTC)
In effect from: Feb 25, 2008, 4:00 PM CST
Expired: Feb 26, 2008, 3:43 AM CST
In force: 12 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 09:49 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, 9.8 hours before the alert went out and 190 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: 1415 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 269 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 25, 2:05 AM CST, 1 hour 40 minutes earlier.

Area forecast discussion, Feb 25, 2:05 AM CST, 1 hour 40 minutes before

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Hazardous weather outlook, Feb 24, 10:36 PM CST, 5 hours 9 minutes before

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Nearby

Winter Storm Warnings in Illinois, 2008 Winter Storm Warnings in Indiana, 2008 Every winter storm warning in 2008

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.