Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 112, NWS Chicago, IL

August 26, 2014Grundy County, Kendall County, Will County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Aug 26, 2014, 10:28 AM CDT for Grundy County, Kendall County, Will County, Illinois. It was in force for 47 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: Aug 26, 2014, 10:28 AM CDT (15:28 UTC)
Expired: Aug 26, 2014, 11:15 AM CDT
In force: 47 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grundy County, IL, Kendall County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 24 km from the middle of the area, began a volume at 15:32 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 3.5 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: 2288 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1037 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: 26 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 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 Aug 26, 9:22 AM CDT, 1 hour 6 minutes earlier.

Area forecast discussion, Aug 26, 9:22 AM CDT, 1 hour 6 minutes before

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Hazardous weather outlook, Aug 26, 4:17 AM CDT, 6 hours 11 minutes before

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In the hours before

Local storm report, Aug 26, 10:02 AM CDT, 26 minutes before

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Special weather statement, Aug 26, 10:08 AM CDT, 20 minutes before

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Local storm report, Aug 26, 10:14 AM CDT, 14 minutes before

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Special weather statement, Aug 26, 10:18 AM CDT, 10 minutes before

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Local storm report, Aug 26, 10:21 AM CDT, 7 minutes before

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Special weather statement, Aug 26, 10:21 AM CDT, 7 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
Aug 26, 8:39 AM CDT	Special Weather Statement	LOT	Ogle	36 min
Aug 26, 8:49 AM CDT	Special Weather Statement	LOT	Grundy, Kankakee, Will	56 min
Aug 26, 9:06 AM CDT	Special Weather Statement	LOT	Ogle, Winnebago	39 min
Aug 26, 9:20 AM CDT	Areal Flood Advisory	LOT	Ogle, Winnebago	3 hr
Aug 26, 9:26 AM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, McHenry, Ogle, Winnebago	49 min
Aug 26, 9:38 AM CDT	Special Weather Statement	LOT	Lee	22 min
Aug 26, 9:49 AM CDT	Special Weather Statement	LOT	Kankakee, Will	56 min
Aug 26, 9:59 AM CDT	Severe Thunderstorm Warning	LOT	Cook, Kane, Lake, McHenry	46 min
Aug 26, 10:03 AM CDT	Special Marine Warning	LOT		117 min
Aug 26, 10:08 AM CDT	Special Weather Statement	LOT	Lee	22 min
Aug 26, 10:18 AM CDT	Special Weather Statement	LOT	DuPage	27 min
Aug 26, 10:21 AM CDT	Special Weather Statement	LOT	Kendall	24 min
Aug 26, 10:25 AM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, Will	50 min
Aug 26, 10:46 AM CDT	Special Weather Statement	LOT	DuPage	29 min
Aug 26, 10:50 AM CDT	Special Weather Statement	LOT	Lake	25 min
Aug 26, 10:58 AM CDT	Special Marine Warning	LOT		92 min
Aug 26, 10:59 AM CDT	Special Weather Statement	LOT	Grundy	31 min
Aug 26, 11:06 AM CDT	Special Weather Statement	LOT	Cook	24 min
Aug 26, 11:17 AM CDT	Special Weather Statement	LOT	Kankakee, Will	58 min
Aug 26, 12:30 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	60 min
Aug 26, 12:01 PM CDT	Special Weather Statement	LOT	Porter	44 min
Aug 26, 12:22 PM CDT	Special Weather Statement	LOT	Jasper, Newton	53 min
Aug 26, 12:47 PM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	58 min
Aug 26, 1:11 PM CDT	Areal Flood Advisory	LOT	Benton, Jasper	3 hr
Aug 26, 1:42 PM CDT	Severe Thunderstorm Warning	LOT	Benton	33 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

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.