Alert archive / Illinois / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 63, NWS Chicago, IL

June 5, 20085 counties in Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 5, 2008, 7:40 AM CDT for 5 counties in Illinois. It was in force for 50 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 5, 2008, 7:40 AM CDT (12:40 UTC)
Expired: Jun 5, 2008, 8:30 AM CDT
In force: 50 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon

Counties Boone County, IL, DeKalb County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

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 5, 4:59 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 0.7 hours before the alert went out and 146 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: 2101 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 11.1

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 5, 5:52 AM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Jun 5, 5:52 AM CDT, 1 hour 48 minutes before

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Hazardous weather outlook, Jun 5, 5:06 AM CDT, 2 hours 34 minutes before

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In the hours before

Local storm report, Jun 5, 2:46 AM CDT, 4 hours 54 minutes before

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Local storm report, Jun 5, 2:48 AM CDT, 4 hours 52 minutes before

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Local storm report, Jun 5, 5:11 AM CDT, 2 hours 29 minutes before

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Local storm report, Jun 5, 5:39 AM CDT, 2 hours 1 minute before

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Local storm report, Jun 5, 6:17 AM CDT, 1 hour 23 minutes before

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Local storm report, Jun 5, 6:24 AM CDT, 1 hour 16 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 4, 7:14 PM CDT	Tornado Warning	LOT	Iroquois	61 min
Jun 4, 7:16 PM CDT	Tornado Warning	LOT	Iroquois, Kankakee	59 min
Jun 4, 7:23 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois	8 hr
Jun 4, 7:45 PM CDT	Tornado Warning	LOT	Livingston	48 min
Jun 4, 8:20 PM CDT	Tornado Warning	LOT	Iroquois, Kankakee	55 min
Jun 4, 8:52 PM CDT	Tornado Warning	LOT	Iroquois	41 min
Jun 4, 8:59 PM CDT	Areal Flood Advisory	LOT	Livingston	57 min
Jun 4, 9:03 PM CDT	Tornado Warning	LOT	LaSalle, Livingston	31 min
Jun 4, 9:17 PM CDT	Tornado Warning	LOT	Iroquois, Kankakee	58 min
Jun 4, 9:38 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	52 min
Jun 4, 9:52 PM CDT	Flash Flood Warning	LOT	Ford, Iroquois, Kankakee, Livingston	8 hr
Jun 4, 10:10 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall	35 min
Jun 4, 10:11 PM CDT	Severe Thunderstorm Warning	LOT	Will	34 min
Jun 4, 10:13 PM CDT	Tornado Warning	LOT	Kankakee	62 min
Jun 4, 10:31 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	44 min
Jun 4, 10:34 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	23 min
Jun 4, 11:29 PM CDT	Flash Flood Warning	LOT	Cook, Kankakee, Will	6 hr
Jun 4, 11:39 PM CDT	Dense Fog Advisory	LOT	Lake, McHenry	4 hr
Jun 5, 1:20 AM CDT	Special Marine Warning	LOT		40 min
Jun 5, 1:21 AM CDT	Severe Thunderstorm Warning	LOT	Cook	54 min
Jun 5, 1:41 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	64 min
Jun 5, 1:48 AM CDT	Special Marine Warning	LOT		117 min
Jun 5, 5:23 AM CDT	Areal Flood Warning	LOT	Kankakee, Will	12 hr
Jun 5, 5:47 AM CDT	Severe Thunderstorm Warning	LOT	Winnebago	20 min
Jun 5, 7:12 AM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	33 min
Jun 5, 7:21 AM CDT	Severe Thunderstorm Warning	LOT	Winnebago	24 min
Jun 5, 7:29 AM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	31 min
Jun 5, 7:56 AM CDT	Special Marine Warning	LOT		94 min
Jun 5, 8:00 AM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	45 min
Jun 5, 9:53 AM CDT	River Flood Warning	LOT	Kankakee	3 days
Jun 5, 9:57 AM CDT	River Flood Warning	LOT	Iroquois	10 hr
Jun 5, 10:45 AM CDT	River Flood Warning	LOT	Bureau, LaSalle	54 hr
Jun 5, 5:06 PM CDT	River Flood Advisory	LOT	Winnebago	4 days
Jun 5, 5:34 PM CDT	Areal Flood Warning	LOT	Kankakee, Will	6 hr
Jun 4, 7:11 PM CDT	Tornado Warning	LOT	Jasper	37 min
Jun 4, 8:02 PM CDT	Areal Flood Advisory	LOT	Jasper, Newton	114 min
Jun 4, 8:15 PM CDT	Tornado Warning	LOT	Jasper, Newton	13 min
Jun 4, 8:53 PM CDT	Severe Thunderstorm Warning	LOT	Jasper	32 min
Jun 4, 10:04 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	41 min
Jun 4, 11:15 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	60 min
Jun 5, 12:15 AM CDT	Flash Flood Warning	LOT	Jasper, Lake, Porter	6 hr
Jun 5, 12:15 AM CDT	Severe Thunderstorm Warning	LOT	Jasper	30 min
Jun 5, 12:57 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	48 min
Jun 5, 9:53 AM CDT	River Flood Warning	LOT	Lake, Newton	5 days

Nearby

Severe Thunderstorm Warnings in Illinois, 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.