Alert archive / Illinois / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 75, NWS Chicago, IL

June 23, 2013Cook County, Lake County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 23, 2013, 5:44 PM CDT for Cook County, Lake County, Illinois. It was in force for 61 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 23, 2013, 5:44 PM CDT (22:44 UTC)
Expired: Jun 23, 2013, 6:45 PM CDT
In force: 61 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cook County, IL, Lake County, IL

The radar

The Chicago radar (KLOT), 64 km from the middle of the area, began a volume at 22:48 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, 10.7 hours before the alert went out and 230 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: 568 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 84 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 Jun 23, 4:21 PM CDT, 1 hour 23 minutes earlier.

Area forecast discussion, Jun 23, 4:21 PM CDT, 1 hour 23 minutes before

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Hazardous weather outlook, Jun 23, 4:14 PM CDT, 1 hour 30 minutes before

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In the hours before

Local storm report, Jun 23, 4:31 PM CDT, 1 hour 13 minutes before

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Special weather statement, Jun 23, 4:36 PM CDT, 1 hour 8 minutes before

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Local storm report, Jun 23, 5:07 PM CDT, 37 minutes before

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Local storm report, Jun 23, 5:15 PM CDT, 29 minutes before

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Local storm report, Jun 23, 5:17 PM CDT, 27 minutes before

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Local storm report, Jun 23, 5:34 PM CDT, 10 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 22, 8:19 PM CDT	River Flood Advisory	LOT	Winnebago	13 hr
Jun 23, 5:47 AM CDT	Marine Dense Fog Advisory	LOT		58 hr
Jun 23, 2:10 PM CDT	Special Weather Statement	LOT	Lee, Ogle, Winnebago	65 min
Jun 23, 2:33 PM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	42 min
Jun 23, 3:14 PM CDT	Special Weather Statement	LOT	Boone, Winnebago	46 min
Jun 23, 3:19 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	56 min
Jun 23, 3:42 PM CDT	Special Weather Statement	LOT	DeKalb, LaSalle	63 min
Jun 23, 3:54 PM CDT	Special Weather Statement	LOT	Boone, McHenry	66 min
Jun 23, 4:23 PM CDT	Special Weather Statement	LOT	Will	22 min
Jun 23, 4:26 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	34 min
Jun 23, 4:36 PM CDT	Special Weather Statement	LOT	Grundy, Kane, Kendall, LaSalle	54 min
Jun 23, 4:46 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, LaSalle	29 min
Jun 23, 5:13 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, DuPage, Kane, Kendall, LaSalle, Will	47 min
Jun 23, 5:14 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	46 min
Jun 23, 5:41 PM CDT	Special Marine Warning	LOT		2 hr
Jun 23, 6:09 PM CDT	Special Weather Statement	LOT	Grundy, Will	36 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2013 Every severe thunderstorm warning in 2013

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.