Alert archive / Illinois / River Flood Warnings in 2026

River Flood Warning 39, NWS Chicago, IL

June 12, 2026LaSalle County, Illinois

NWS Chicago, IL issued this river flood warning at Jun 12, 2026, 10:39 AM CDT for LaSalle County, Illinois. It was in force for 38 hr.

The area

The counties it named.

The facts

Issued: Jun 12, 2026, 10:39 AM CDT (15:39 UTC)
Expired: Jun 14, 2026, 1:00 AM CDT
In force: 38 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: Minor

County LaSalle County, IL

The radar

The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 15:40 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 river

Written for the forecast point Illinois River at Ottawa (OTWI2).

Action stage: 461 ft
Minor stage: 463 ft
Moderate stage: 467 ft
Major stage: 471 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood 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 river flood warning went out at Jun 12, 5:54 AM CDT, 4 hours 45 minutes earlier.

Area forecast discussion, Jun 12, 5:54 AM CDT, 4 hours 45 minutes before

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Hazardous weather outlook, Jun 12, 3:26 AM CDT, 7 hours 13 minutes before

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In the hours before

Local storm report, Jun 12, 7:02 AM CDT, 3 hours 37 minutes before

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Local storm report, Jun 12, 7:26 AM CDT, 3 hours 13 minutes before

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Local storm report, Jun 12, 9:09 AM CDT, 1 hour 30 minutes before

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Local storm report, Jun 12, 9:11 AM CDT, 1 hour 28 minutes before

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Local storm report, Jun 12, 9:26 AM CDT, 1 hour 13 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 11, 7:03 PM CDT	Areal Flood Advisory	LOT	DeKalb, Ogle	2 hr
Jun 11, 7:11 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Livingston	64 min
Jun 11, 7:14 PM CDT	Severe Thunderstorm Warning	LOT	Kane	26 min
Jun 11, 7:20 PM CDT	Tornado Warning	LOT	Will	40 min
Jun 11, 7:24 PM CDT	Tornado Warning	LOT	Ford, Iroquois	40 min
Jun 11, 7:37 PM CDT	Areal Flood Advisory	LOT	Will	3 hr
Jun 11, 7:40 PM CDT	Tornado Warning	LOT	Ford	65 min
Jun 11, 7:53 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Cook, DuPage, Kendall, Will	52 min
Jun 11, 7:54 PM CDT	Tornado Warning	LOT	Cook, DuPage	16 min
Jun 11, 8:04 PM CDT	Tornado Warning	LOT	DuPage	26 min
Jun 11, 8:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	Cook, Lake	53 min
Jun 11, 8:13 PM CDT	Special Marine Warning	LOT		67 min
Jun 11, 8:17 PM CDT	Tornado Warning	LOT	Cook	28 min
Jun 11, 9:06 PM CDT	Areal Flood Advisory	LOT	Boone, DeKalb, Lake, Lee, McHenry, Ogle and 1 more	22 hr
Jun 11, 9:44 PM CDT	River Flood Warning	LOT	Cook	37 hr
Jun 11, 9:47 PM CDT	River Flood Warning	LOT	Cook	19 hr
Jun 11, 10:49 PM CDT	Areal Flood Advisory	LOT	Will	20 hr
Jun 12, 10:57 AM CDT	River Flood Warning	LOT	Winnebago	33 hr
Jun 12, 11:07 AM CDT	River Flood Watch	LOT	Livingston	8 hr
Jun 11, 7:14 PM CDT	Tornado Warning	LOT	Lake	34 min
Jun 11, 7:30 PM CDT	Tornado Warning	LOT	Lake	30 min
Jun 11, 7:35 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	LOT	Porter	34 min
Jun 11, 7:51 PM CDT	Tornado Warning	LOT	Jasper, Porter	39 min
Jun 11, 8:13 PM CDT	Tornado Warning	LOT	Jasper, Lake, Newton	31 min
Jun 11, 8:26 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LOT	Lake	34 min
Jun 11, 8:30 PM CDT	Severe Thunderstorm Warning	LOT	Jasper, Lake, Porter	49 min
Jun 12, 11:09 AM CDT	River Flood Watch	LOT	Lake, Newton	8 hr

Nearby

River Flood Warnings in Illinois, 2026 Every river flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.