Alert archive / Illinois / Tornado Warnings in 2025

Tornado Warning 10, NWS Chicago, IL

April 2, 2025Iroquois County, Illinois

NWS Chicago, IL issued this tornado warning at Apr 2, 2025, 5:13 PM CDT for Iroquois County, Illinois. It was in force for 32 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: Apr 2, 2025, 5:13 PM CDT (22:13 UTC)
Expired: Apr 2, 2025, 5:45 PM CDT
In force: 32 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Iroquois County, IL

The radar

The Chicago radar (KLOT), 98 km from the middle of the area, began a volume at 22:12 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
Apr 2, 3:17 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.2 hours before the alert went out and 93 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: 864 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 948 m²/s²
0-3 km storm-relative helicity: 1028 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Apr 2, 4:50 PM CDT, 23 minutes earlier.

Area forecast discussion, Apr 2, 4:50 PM CDT, 23 minutes before

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Hazardous weather outlook, Apr 2, 4:00 PM CDT, 1 hour 13 minutes before

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In the hours before

Local storm report, Apr 2, 12:12 PM CDT, 5 hours 1 minute before

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Special weather statement, Apr 2, 12:13 PM CDT, 5 hours before

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Local storm report, Apr 2, 12:29 PM CDT, 4 hours 44 minutes before

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Local storm report, Apr 2, 12:44 PM CDT, 4 hours 29 minutes before

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Local storm report, Apr 2, 12:49 PM CDT, 4 hours 24 minutes before

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Local storm report, Apr 2, 1:16 PM CDT, 3 hours 57 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
Apr 2, 3:44 AM CDT	Wind Advisory	LOT	Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston	15 hr
Apr 2, 11:23 AM CDT	Special Weather Statement	LOT	Ford, Iroquois	82 min
Apr 2, 11:44 AM CDT	Areal Flood Advisory	LOT	Cook, Will	3 hr
Apr 2, 4:02 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	58 min
Apr 2, 4:57 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	48 min
Apr 2, 5:02 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	28 min
Apr 2, 5:39 PM CDT	Areal Flood Advisory	LOT	Ford, Iroquois	3 hr
Apr 2, 6:47 PM CDT	Small Craft Advisory	LOT		17 hr
Apr 2, 11:47 AM CDT	Areal Flood Advisory	LOT	Lake	3 hr
Apr 2, 12:13 PM CDT	Special Weather Statement	LOT	Benton, Jasper, Newton	62 min
Apr 2, 5:17 PM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	43 min
Apr 2, 5:57 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Newton	33 min
Apr 2, 6:03 PM CDT	Tornado Warning	LOT	Jasper	27 min
Apr 2, 6:10 PM CDT	Severe Thunderstorm Warning	LOT	Benton, Jasper, Newton	35 min

Nearby

Tornado Warnings in Illinois, 2025 Every tornado warning in 2025 Tornadoes in 2025

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.