Alert archive / Illinois / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 4, NWS Chicago, IL

January 7, 2008Cook County, Will County, Illinois; Lake County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jan 7, 2008, 5:24 PM CST for Cook County, Will County, Illinois; Lake County, Indiana. It was in force for 52 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: Jan 7, 2008, 5:24 PM CST (23:24 UTC)
Expired: Jan 7, 2008, 6:16 PM CST
In force: 52 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

Counties Cook County, IL, Will County, IL, Lake County, IN

The radar

The Chicago radar (KLOT), 35 km from the middle of the area, began a volume at 23:24 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
Jan 7, 2:35 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.4 hours before the alert went out and 180 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: 383 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jan 7, 5:00 PM CST, 24 minutes earlier.

Area forecast discussion, Jan 7, 5:00 PM CST, 24 minutes before

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Hazardous weather outlook, Jan 7, 4:40 PM CST, 44 minutes before

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In the hours before

Local storm report, Jan 7, 4:09 PM CST, 1 hour 15 minutes before

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Local storm report, Jan 7, 4:12 PM CST, 1 hour 12 minutes before

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Local storm report, Jan 7, 4:20 PM CST, 1 hour 4 minutes before

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Local storm report, Jan 7, 4:46 PM CST, 38 minutes before

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Local storm report, Jan 7, 4:48 PM CST, 36 minutes before

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Local storm report, Jan 7, 5:06 PM CST, 18 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 7, 10:07 AM CST	River Flood Watch	LOT	Kankakee	24 hr
Jan 7, 10:07 AM CST	River Flood Watch	LOT	Iroquois	24 hr
Jan 7, 10:07 AM CST	River Flood Watch	LOT	Winnebago	24 hr
Jan 7, 10:07 AM CST	River Flood Watch	LOT	LaSalle	24 hr
Jan 7, 10:49 AM CST	River Flood Advisory	LOT	Grundy	25 hr
Jan 7, 10:59 AM CST	River Flood Watch	LOT	Bureau, LaSalle	24 hr
Jan 7, 3:04 PM CST	Severe Thunderstorm Warning	LOT	Boone, Winnebago	25 min
Jan 7, 3:12 PM CST	Tornado Warning	LOT	Boone, Winnebago	33 min
Jan 7, 3:25 PM CST	Tornado Warning	LOT	Boone, McHenry	35 min
Jan 7, 3:59 PM CST	Severe Thunderstorm Warning	LOT	McHenry	16 min
Jan 7, 4:36 PM CST	Severe Thunderstorm Warning	LOT	LaSalle	39 min
Jan 7, 5:10 PM CST	Special Marine Warning	LOT		92 min
Jan 7, 5:29 PM CST	Severe Thunderstorm Warning	LOT	Ford, Grundy, Kankakee, LaSalle, Livingston, Will	61 min
Jan 7, 5:46 PM CST	Special Marine Warning	LOT		59 min
Jan 7, 5:45 AM CST	River Flood Warning	LOT	Lake, Newton	107 days
Jan 7, 10:07 AM CST	River Flood Watch	LOT	Porter	24 hr
Jan 7, 10:07 AM CST	River Flood Watch	LOT	Jasper, Porter	24 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2008 Severe Thunderstorm Warnings in Indiana, 2008 Every severe thunderstorm 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.