Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 104, NWS Chicago, IL

August 25, 2014Cook County, Kankakee County, Will County, Illinois; Lake County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Aug 25, 2014, 1:51 PM CDT for Cook County, Kankakee County, Will County, Illinois; Lake County, Indiana. It was in force for 39 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 25, 2014, 1:51 PM CDT (18:51 UTC)
Expired: Aug 25, 2014, 2:30 PM CDT
In force: 39 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Chicago radar (KLOT), 33 km from the middle of the area, began a volume at 18:50 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, 6.9 hours before the alert went out and 166 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: 2485 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 70 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 25, 1:04 PM CDT, 47 minutes earlier.

Area forecast discussion, Aug 25, 1:04 PM CDT, 47 minutes before

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Hazardous weather outlook, Aug 25, 11:00 AM CDT, 2 hours 51 minutes before

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In the hours before

Special weather statement, Aug 25, 12:20 PM CDT, 1 hour 31 minutes before

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Special weather statement, Aug 25, 12:37 PM CDT, 1 hour 14 minutes before

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Special weather statement, Aug 25, 12:50 PM CDT, 1 hour 1 minute before

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Special weather statement, Aug 25, 1:03 PM CDT, 48 minutes before

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Local storm report, Aug 25, 1:23 PM CDT, 28 minutes before

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Special weather statement, Aug 25, 1:44 PM 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 25, 10:29 AM CDT	Special Weather Statement	LOT	Winnebago	31 min
Aug 25, 11:41 AM CDT	Special Weather Statement	LOT	Lake	34 min
Aug 25, 11:59 AM CDT	Special Weather Statement	LOT	Cook	31 min
Aug 25, 12:20 PM CDT	Special Weather Statement	LOT	Cook	25 min
Aug 25, 12:24 PM CDT	Special Marine Warning	LOT		96 min
Aug 25, 12:37 PM CDT	Special Weather Statement	LOT	Kendall	23 min
Aug 25, 12:50 PM CDT	Special Weather Statement	LOT	Cook	25 min
Aug 25, 12:58 PM CDT	Areal Flood Advisory	LOT	Cook	4 hr
Aug 25, 1:03 PM CDT	Special Weather Statement	LOT	Will	42 min
Aug 25, 1:31 PM CDT	Areal Flood Advisory	LOT	Cook, Kankakee, Will	4 hr
Aug 25, 1:38 PM CDT	Special Marine Warning	LOT		97 min
Aug 25, 1:44 PM CDT	Special Weather Statement	LOT	Will	46 min
Aug 25, 2:36 PM CDT	Special Weather Statement	LOT	Kankakee	24 min
Aug 25, 2:40 PM CDT	Severe Thunderstorm Warning	LOT	Lee	65 min
Aug 25, 2:55 PM CDT	Special Weather Statement	LOT	Boone, McHenry, Ogle	35 min
Aug 25, 3:11 PM CDT	Special Weather Statement	LOT	Kankakee	34 min
Aug 25, 3:42 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, LaSalle, Lee	48 min
Aug 25, 3:43 PM CDT	Special Weather Statement	LOT	Iroquois	47 min
Aug 25, 3:59 PM CDT	Special Marine Warning	LOT		2 hr
Aug 25, 4:17 PM CDT	Special Weather Statement	LOT	LaSalle	28 min
Aug 25, 4:21 PM CDT	Special Weather Statement	LOT	DuPage	24 min
Aug 25, 5:17 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	43 min
Aug 25, 5:35 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	62 min
Aug 25, 5:36 PM CDT	Areal Flood Advisory	LOT	Grundy, LaSalle, Livingston	4 hr
Aug 25, 6:18 PM CDT	Special Weather Statement	LOT	Ford, Iroquois	27 min
Aug 25, 2:25 PM CDT	Special Weather Statement	LOT	Lake	35 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Severe Thunderstorm Warnings in Indiana, 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.