Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 65, NWS Chicago, IL

June 27, 2019DeKalb County, Lee County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 27, 2019, 6:07 PM CDT for DeKalb County, Lee County, Illinois. It was in force for 27 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 27, 2019, 6:07 PM CDT (23:07 UTC)
Expired: Jun 27, 2019, 6:34 PM CDT
In force: 27 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties DeKalb County, IL, Lee County, IL

The radar

The Chicago radar (KLOT), 82 km from the middle of the area, began a volume at 23:07 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 27, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.1 hours before the alert went out and 124 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: 1660 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 72 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 27, 6:00 PM CDT, 7 minutes earlier.

Area forecast discussion, Jun 27, 6:00 PM CDT, 7 minutes before

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Hazardous weather outlook, Jun 27, 4:52 PM CDT, 1 hour 15 minutes before

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In the hours before

Special weather statement, Jun 27, 5:11 PM CDT, 56 minutes before

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Special weather statement, Jun 27, 5:12 PM CDT, 55 minutes before

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Special weather statement, Jun 27, 5:40 PM CDT, 27 minutes before

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Special weather statement, Jun 27, 5:44 PM CDT, 23 minutes before

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Special weather statement, Jun 27, 5:49 PM CDT, 18 minutes before

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Special weather statement, Jun 27, 5:58 PM CDT, 9 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 26, 7:05 PM CDT	Special Weather Statement	LOT	Kane	25 min
Jun 26, 7:21 PM CDT	Special Weather Statement	LOT	DuPage	24 min
Jun 26, 7:30 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	33 min
Jun 26, 7:31 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	29 min
Jun 26, 7:34 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	26 min
Jun 26, 7:59 PM CDT	Special Weather Statement	LOT	DuPage	31 min
Jun 26, 8:20 PM CDT	Special Weather Statement	LOT	Will	25 min
Jun 26, 8:22 PM CDT	Special Weather Statement	LOT	Kendall	23 min
Jun 26, 8:35 PM CDT	Severe Thunderstorm Warning	LOT	Kendall, Will	24 min
Jun 26, 8:40 PM CDT	Special Weather Statement	LOT	DeKalb	35 min
Jun 26, 8:48 PM CDT	Special Weather Statement	LOT	Will	27 min
Jun 26, 8:55 PM CDT	Severe Thunderstorm Warning	LOT	Cook	50 min
Jun 26, 9:03 PM CDT	Flash Flood Warning	LOT	Cook, Will	4 hr
Jun 26, 9:08 PM CDT	Special Marine Warning	LOT		67 min
Jun 26, 9:11 PM CDT	Severe Thunderstorm Warning	LOT	Will	49 min
Jun 26, 9:19 PM CDT	Areal Flood Advisory	LOT	Will	3 hr
Jun 26, 9:24 PM CDT	Special Weather Statement	LOT	Will	36 min
Jun 26, 9:43 PM CDT	Areal Flood Advisory	LOT	Kankakee, Will	3 hr
Jun 26, 10:30 PM CDT	Areal Flood Advisory	LOT	Kankakee	2 hr
Jun 26, 10:39 PM CDT	Flash Flood Warning	LOT	Kankakee	6 hr
Jun 26, 10:55 PM CDT	Areal Flood Advisory	LOT	DeKalb, Lee	3 hr
Jun 26, 11:15 PM CDT	Areal Flood Advisory	LOT	Cook, Will	3 hr
Jun 26, 11:38 PM CDT	Areal Flood Advisory	LOT	Iroquois	3 hr
Jun 26, 11:48 PM CDT	Flash Flood Warning	LOT	Cook, Will	3 hr
Jun 27, 12:18 AM CDT	Special Weather Statement	LOT	Will	27 min
Jun 27, 12:21 AM CDT	Special Weather Statement	LOT	Grundy	24 min
Jun 27, 12:29 AM CDT	Areal Flood Advisory	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston, Will	2 hr
Jun 27, 12:42 AM CDT	Areal Flood Advisory	LOT	Kankakee	2 hr
Jun 27, 12:52 AM CDT	Flash Flood Warning	LOT	Cook, Will	6 hr
Jun 27, 12:52 AM CDT	Special Weather Statement	LOT	Grundy	38 min
Jun 27, 1:26 AM CDT	Flash Flood Warning	LOT	Iroquois, Kankakee	3 hr
Jun 27, 2:22 AM CDT	River Flood Advisory	LOT	Cook	4 hr
Jun 27, 2:41 AM CDT	Flash Flood Warning	LOT	Cook, Will	6 hr
Jun 27, 4:43 AM CDT	Areal Flood Warning	LOT	Kankakee	12 hr
Jun 27, 6:15 AM CDT	River Flood Warning	LOT	Cook	39 hr
Jun 27, 6:21 AM CDT	River Flood Advisory	LOT	Cook	27 hr
Jun 27, 7:46 AM CDT	River Flood Warning	LOT	Kankakee	56 hr
Jun 27, 8:37 AM CDT	Areal Flood Warning	LOT	Cook, Will	9 hr
Jun 27, 4:27 PM CDT	Special Weather Statement	LOT	Boone, Winnebago	48 min
Jun 27, 4:50 PM CDT	Special Weather Statement	LOT	Lee, Ogle	55 min
Jun 27, 5:11 PM CDT	Special Weather Statement	LOT	DeKalb, Kane, McHenry	49 min
Jun 27, 5:12 PM CDT	Special Weather Statement	LOT	Boone	33 min
Jun 27, 5:20 PM CDT	Special Marine Warning	LOT		115 min
Jun 27, 5:40 PM CDT	Special Weather Statement	LOT	McHenry	50 min
Jun 27, 5:44 PM CDT	Special Weather Statement	LOT	Grundy, Kendall, LaSalle	61 min
Jun 27, 5:49 PM CDT	Special Weather Statement	LOT	DuPage, Lake	56 min
Jun 27, 5:58 PM CDT	Special Weather Statement	LOT	DeKalb	62 min
Jun 27, 6:32 PM CDT	Special Weather Statement	LOT	Cook, Will	58 min
Jun 27, 6:37 PM CDT	Special Weather Statement	LOT	Grundy, LaSalle	53 min
Jun 27, 6:41 PM CDT	Special Weather Statement	LOT	Lake	34 min
Jun 27, 6:44 PM CDT	Special Weather Statement	LOT	Kendall	46 min
Jun 27, 6:58 PM CDT	Special Marine Warning	LOT		62 min
Jun 26, 7:13 PM CDT	Special Weather Statement	LOT	Jasper	47 min
Jun 26, 8:03 PM CDT	Special Weather Statement	LOT	Jasper	42 min
Jun 26, 8:45 PM CDT	Special Weather Statement	LOT	Lake	30 min
Jun 26, 9:32 PM CDT	Special Weather Statement	LOT	Jasper	43 min
Jun 26, 9:38 PM CDT	Special Weather Statement	LOT	Newton	37 min
Jun 26, 9:56 PM CDT	Areal Flood Advisory	LOT	Jasper, Newton	3 hr
Jun 26, 9:59 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	46 min
Jun 26, 10:00 PM CDT	Areal Flood Advisory	LOT	Porter	3 hr
Jun 26, 10:23 PM CDT	Special Weather Statement	LOT	Newton	37 min
Jun 26, 11:03 PM CDT	Special Weather Statement	LOT	Jasper	42 min
Jun 27, 1:43 AM CDT	Special Weather Statement	LOT	Lake	32 min
Jun 27, 1:46 AM CDT	Flash Flood Warning	LOT	Lake	3 hr
Jun 27, 6:21 AM CDT	River Flood Advisory	LOT	Lake	11 hr
Jun 27, 10:06 AM CDT	River Flood Advisory	LOT	Lake	7 hr
Jun 27, 3:28 PM CDT	River Flood Warning	LOT	Lake	28 hr
Jun 27, 5:27 PM CDT	River Flood Warning	LOT	Lake	9 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2019 Every severe thunderstorm warning in 2019

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.