Alert archive / Illinois / Winter Storm Warnings in 2007

Winter Storm Warning 5, NWS Chicago, IL

November 30, 200712 counties in Illinois; Lake County, Porter County, Indiana

NWS Chicago, IL issued this winter storm warning at Nov 30, 2007, 3:37 PM CST for 12 counties in Illinois; Lake County, Porter County, Indiana. It took effect at Dec 1, 2007, 12:00 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: Nov 30, 2007, 3:37 PM CST (21:37 UTC)
In effect from: Dec 1, 2007, 12:00 PM CST
Expired: Dec 2, 2007, 12:00 AM CST
In force: 12 hr
Issued by: NWS Chicago, IL

Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Lake County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 42 km from the middle of the area, began a volume at 21:43 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 12:00Z, 9.6 hours before the alert went out and 172 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: 1082 m above ground
0-6 km bulk shear: 111 kt
0-1 km storm-relative helicity: -183 m²/s²
0-3 km storm-relative helicity: -4 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 Nov 30, 3:12 PM CST, 25 minutes earlier.

Area forecast discussion, Nov 30, 3:12 PM CST, 25 minutes before

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Hazardous weather outlook, Nov 30, 8:11 AM CST, 7 hours 26 minutes before

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Nearby

Winter Storm Warnings in Illinois, 2007 Winter Storm Warnings in Indiana, 2007 Every winter storm warning in 2007

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.