Alert archive / Illinois / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 39, NWS Chicago, IL

June 12, 2010Iroquois County, Kankakee County, Will County, Illinois; Benton County, Lake County, Newton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jun 12, 2010, 3:56 PM CDT for Iroquois County, Kankakee County, Will County, Illinois; Benton County, Lake County, Newton County, Indiana. It was in force for 49 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 12, 2010, 3:56 PM CDT (20:56 UTC)
Expired: Jun 12, 2010, 4:45 PM CDT
In force: 49 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.5 in
Wind: 70.0 mph

Counties Iroquois County, IL, Kankakee County, IL, Will County, IL, Benton County, IN, Lake County, IN, Newton County, IN

The radar

The Chicago radar (KLOT), 72 km from the middle of the area, began a volume at 20:57 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 12, 12:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.9 hours before the alert went out and 131 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: 2783 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

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 12, 3:01 PM CDT, 55 minutes earlier.

Area forecast discussion, Jun 12, 3:01 PM CDT, 55 minutes before

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Hazardous weather outlook, Jun 12, 3:37 PM CDT, 19 minutes before

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In the hours before

Local storm report, Jun 12, 3:16 PM CDT, 40 minutes before

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Local storm report, Jun 12, 3:18 PM CDT, 38 minutes before

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Local storm report, Jun 12, 3:23 PM CDT, 33 minutes before

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Local storm report, Jun 12, 3:25 PM CDT, 31 minutes before

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Local storm report, Jun 12, 3:32 PM CDT, 24 minutes before

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Local storm report, Jun 12, 3:55 PM CDT, 1 minute 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 12, 9:01 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, LaSalle, Lee	44 min
Jun 12, 9:46 AM CDT	Severe Thunderstorm Warning	LOT	DeKalb, DuPage, Kane, Kendall, Will	44 min
Jun 12, 10:33 AM CDT	Special Weather Statement	LOT	Cook, DuPage	57 min
Jun 12, 10:35 AM CDT	Special Marine Warning	LOT		55 min
Jun 12, 2:28 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	47 min
Jun 12, 3:04 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	56 min
Jun 12, 3:10 PM CDT	Areal Flood Advisory	LOT	Grundy, LaSalle, Livingston	6 hr
Jun 12, 3:12 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more	48 min
Jun 12, 4:04 PM CDT	Flash Flood Warning	LOT	Iroquois	6 hr
Jun 12, 4:31 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee, Will	57 min
Jun 12, 12:21 PM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	39 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2010 Severe Thunderstorm Warnings in Indiana, 2010 Every severe thunderstorm warning 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.