Alert archive / Illinois / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 92, NWS Chicago, IL

June 15, 2008Cook County, DuPage County, Will County, Illinois; Lake County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jun 15, 2008, 7:00 AM CDT for Cook County, DuPage County, Will County, Illinois; Lake County, Indiana. It was in force for 60 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: Jun 15, 2008, 7:00 AM CDT (12:00 UTC)
Expired: Jun 15, 2008, 8:00 AM CDT
In force: 60 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

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

The radar

The Chicago radar (KLOT), 27 km from the middle of the area, began a volume at 12:02 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
Jun 15, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 0.0 hours before the alert went out and 182 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: 325 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 1628 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.8

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 Jun 15, 5:44 AM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, Jun 15, 5:44 AM CDT, 1 hour 16 minutes before

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Hazardous weather outlook, Jun 15, 4:40 AM CDT, 2 hours 20 minutes before

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In the hours before

Local storm report, Jun 15, 6:40 AM CDT, 20 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
Jun 15, 6:25 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Lee, Ogle	50 min
Jun 15, 6:32 AM CDT	Special Marine Warning	LOT		118 min
Jun 15, 6:49 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, LaSalle, Lee	41 min
Jun 15, 8:34 AM CDT	Special Marine Warning	LOT		51 min
Jun 15, 9:21 AM CDT	River Flood Advisory	LOT	Cook	18 hr
Jun 15, 2:23 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle	67 min
Jun 15, 2:51 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, DuPage, Kane, Kendall, LaSalle, Will	39 min
Jun 15, 3:01 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	59 min
Jun 15, 3:17 PM CDT	Flash Flood Warning	LOT	LaSalle	3 hr
Jun 15, 3:23 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Grundy, Kendall, Will	50 min
Jun 15, 3:26 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	64 min
Jun 15, 3:51 PM CDT	Areal Flood Advisory	LOT	Kankakee, Will	3 hr
Jun 15, 4:15 PM CDT	Areal Flood Advisory	LOT	Kankakee, Will	3 hr
Jun 15, 4:32 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	46 min
Jun 15, 4:46 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	40 min

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.