Alert archive / Illinois / Tornado Warnings in 2010

Tornado Warning 35, NWS Chicago, IL

December 31, 2010Livingston County, Illinois

NWS Chicago, IL issued this tornado warning at Dec 31, 2010, 1:22 PM CST for Livingston County, Illinois. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 31, 2010, 1:22 PM CST (19:22 UTC)
Expired: Dec 31, 2010, 2:00 PM CST
In force: 38 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

County Livingston County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 19:25 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 31, 1:16 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.4 hours before the alert went out and 83 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: 506 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 450 m²/s²
0-3 km storm-relative helicity: 427 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 tornado 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 tornado warning went out at Dec 31, 1:11 PM CST, 11 minutes earlier.

Area forecast discussion, Dec 31, 1:11 PM CST, 11 minutes before

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Hazardous weather outlook, Dec 31, 11:35 AM CST, 1 hour 47 minutes before

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In the hours before

Special weather statement, Dec 31, 12:17 PM CST, 1 hour 5 minutes before

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Special weather statement, Dec 31, 12:33 PM CST, 49 minutes before

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Special weather statement, Dec 31, 12:48 PM CST, 34 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
Dec 31, 8:24 AM CST	River Flood Advisory	LOT	Cook	5 hr
Dec 31, 8:50 AM CST	River Flood Advisory	LOT	Will	51 hr
Dec 31, 10:30 AM CST	River Flood Advisory	LOT	LaSalle	53 hr
Dec 31, 12:17 PM CST	Special Weather Statement	LOT	Livingston	28 min
Dec 31, 12:33 PM CST	Special Weather Statement	LOT	Livingston	27 min
Dec 31, 12:48 PM CST	Special Weather Statement	LOT	Grundy	42 min
Dec 31, 1:36 PM CST	River Flood Warning	LOT	Cook	32 hr
Dec 31, 1:44 PM CST	River Flood Advisory	LOT	Cook	37 hr
Dec 31, 2:07 PM CST	Special Weather Statement	LOT	Kankakee, Will	38 min
Dec 31, 2:44 PM CST	Special Weather Statement	LOT	Kankakee	46 min
Dec 31, 6:25 AM CST	Special Weather Statement	LOT	Lake	35 min
Dec 31, 1:36 PM CST	River Flood Warning	LOT	Lake	25 hr

Nearby

Tornado Warnings in Illinois, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.