Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 45, NWS Chicago, IL

May 27, 2019Iroquois County, Illinois; Benton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at May 27, 2019, 6:06 PM CDT for Iroquois County, Illinois; Benton County, Indiana. It was in force for 54 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: May 27, 2019, 6:06 PM CDT (23:06 UTC)
Expired: May 27, 2019, 7:00 PM CDT
In force: 54 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Iroquois County, IL, Benton County, IN

The radar

The Chicago radar (KLOT), 112 km from the middle of the area, began a volume at 23:05 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
May 27, 1:22 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.1 hours before the alert went out and 105 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 124 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 May 27, 5:52 PM CDT, 14 minutes earlier.

Area forecast discussion, May 27, 5:52 PM CDT, 14 minutes before

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Hazardous weather outlook, May 27, 4:48 PM CDT, 1 hour 18 minutes before

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In the hours before

Special weather statement, May 27, 5:20 PM CDT, 46 minutes before

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Special weather statement, May 27, 5:32 PM CDT, 34 minutes before

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Local storm report, May 27, 5:41 PM CDT, 25 minutes before

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Special weather statement, May 27, 5:42 PM CDT, 24 minutes before

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Local storm report, May 27, 5:51 PM CDT, 15 minutes before

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Special weather statement, May 27, 6:01 PM CDT, 5 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
May 26, 8:05 PM CDT	River Flood Advisory	LOT	LaSalle	13 hr
May 26, 8:08 PM CDT	River Flood Watch	LOT	Kane, Kendall	13 hr
May 27, 9:22 AM CDT	River Flood Warning	LOT	Kane, Kendall	21 days
May 27, 9:22 AM CDT	River Flood Warning	LOT	LaSalle	5 days
May 27, 9:26 AM CDT	River Flood Watch	LOT	Winnebago	14 min
May 27, 10:02 AM CDT	River Flood Warning	LOT	Winnebago	14 days
May 27, 10:12 AM CDT	River Flood Warning	LOT	Winnebago	9 hr
May 27, 10:38 AM CDT	River Flood Warning	LOT	Ogle	9 hr
May 27, 10:48 AM CDT	River Flood Watch	LOT	Winnebago	9 hr
May 27, 11:33 AM CDT	River Flood Warning	LOT	LaSalle	5 days
May 27, 11:38 AM CDT	River Flood Advisory	LOT	Grundy	5 days
May 27, 1:10 PM CDT	Special Weather Statement	LOT	Kendall	35 min
May 27, 1:18 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kendall, LaSalle	42 min
May 27, 1:43 PM CDT	Severe Thunderstorm Warning	LOT	DuPage, Kane, Kendall, Will	62 min
May 27, 1:55 PM CDT	Special Marine Warning	LOT		2 hr
May 27, 2:00 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane, Kendall, Will	2 hr
May 27, 2:07 PM CDT	Tornado Warning	LOT	Cook, Will	38 min
May 27, 2:13 PM CDT	Severe Thunderstorm Warning	LOT	Cook	62 min
May 27, 2:30 PM CDT	Tornado Warning	LOT	Ogle	45 min
May 27, 2:38 PM CDT	Flash Flood Warning	LOT	Cook	3 hr
May 27, 2:44 PM CDT	Severe Thunderstorm Warning	LOT	Cook	61 min
May 27, 3:20 PM CDT	Severe Thunderstorm Warning	LOT	Lee	40 min
May 27, 3:40 PM CDT	Tornado Warning	LOT	Lee	35 min
May 27, 4:00 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	45 min
May 27, 4:13 PM CDT	Tornado Warning	LOT	LaSalle, Lee	32 min
May 27, 4:14 PM CDT	Tornado Warning	LOT	Cook, Will	46 min
May 27, 4:17 PM CDT	Areal Flood Advisory	LOT	Cook, Will	3 hr
May 27, 4:20 PM CDT	Special Marine Warning	LOT		115 min
May 27, 4:25 PM CDT	Special Weather Statement	LOT	Cook, DuPage, Kane	50 min
May 27, 4:43 PM CDT	Areal Flood Advisory	LOT	DuPage, Kane, Kendall, Will	3 hr
May 27, 5:20 PM CDT	Special Weather Statement	LOT	Will	40 min
May 27, 5:24 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois	33 min
May 27, 5:27 PM CDT	Areal Flood Advisory	LOT	Cook, DuPage, Kane, Kendall, Will	3 hr
May 27, 5:32 PM CDT	Special Weather Statement	LOT	Cook	13 min
May 27, 5:42 PM CDT	Special Weather Statement	LOT	Iroquois	48 min
May 27, 3:34 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	56 min
May 27, 4:02 PM CDT	Tornado Warning	LOT	Porter	13 min
May 27, 4:52 PM CDT	Tornado Warning	LOT	Lake, Porter	42 min
May 27, 6:01 PM CDT	Special Weather Statement	LOT	Jasper, Newton	29 min
May 27, 6:10 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	21 min
May 27, 6:58 PM CDT	Severe Thunderstorm Warning	LOT	Benton	9 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2019 Severe Thunderstorm Warnings in Indiana, 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.