Alert archive / Illinois / River Flood Warnings in 2026

River Flood Warning 28, NWS Lincoln, IL

June 20, 2026Cass County, Mason County, Illinois

NWS Lincoln, IL issued this river flood warning at Jun 20, 2026, 7:14 PM CDT for Cass County, Mason County, Illinois. It took effect at Jun 23, 2026, 5:30 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Jun 20, 2026, 7:14 PM CDT (00:14 UTC)
In effect from: Jun 23, 2026, 5:30 AM CDT
Expired: Jun 22, 2026, 8:37 PM CDT
In force
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: Minor

Counties Cass County, IL, Mason County, IL

The radar

The Lincoln radar (KILX), 64 km from the middle of the area, began a volume at 00:17 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 Sangamon River near Chandlerville (CDLI2).

Action stage: 454 ft
Minor stage: 456.6 ft
Moderate stage: 459 ft
Major stage: 462 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 Lincoln, IL wrote its last area forecast discussion before this river flood warning went out at Jun 20, 7:00 PM CDT, 14 minutes earlier.

Area forecast discussion, Jun 20, 7:00 PM CDT, 14 minutes before

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Hazardous weather outlook, Jun 20, 2:01 PM CDT, 5 hours 13 minutes before

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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 7:20 PM CDT	River Flood Warning	ILX	Fulton, Knox	3 days
Jun 21, 9:24 AM CDT	River Flood Warning	ILX	Lawrence	10 days
Jun 21, 10:06 AM CDT	River Flood Warning	ILX	Fulton	34 hr
Jun 21, 2:15 PM CDT	Areal Flood Advisory	ILX	Sangamon	5 hr
Jun 21, 2:52 PM CDT	Severe Thunderstorm Warning	ILX	Effingham, Shelby	64 min
Jun 21, 3:04 PM CDT	Tornado Warning	ILX	Effingham, Shelby	41 min
Jun 21, 3:09 PM CDT	Flash Flood Warning	ILX	Effingham, Shelby	4 hr
Jun 21, 3:14 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Effingham, Jasper, Richland	61 min
Jun 21, 3:22 PM CDT	Tornado Warning	ILX	Clay, Effingham, Jasper, Richland	38 min
Jun 21, 3:38 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Cumberland, Effingham, Jasper, Shelby	67 min
Jun 21, 3:51 PM CDT	Tornado Warning Tornado observed	ILX	Crawford, Jasper	39 min
Jun 21, 3:55 PM CDT	Tornado Warning	ILX	Clay, Effingham	32 min
Jun 21, 3:56 PM CDT	Flash Flood Warning	ILX	Clay, Effingham	4 hr
Jun 21, 3:59 PM CDT	Tornado Warning	ILX	Clark, Coles, Cumberland	46 min
Jun 21, 4:06 PM CDT	Flash Flood Warning	ILX	Cumberland, Effingham	3 hr
Jun 21, 4:10 PM CDT	Tornado Warning	ILX	Clay, Effingham	17 min
Jun 21, 4:23 PM CDT	Tornado Warning Tornado observed	ILX	Clark, Crawford, Jasper	43 min
Jun 21, 4:29 PM CDT	Tornado Warning	ILX	Clay	46 min
Jun 21, 4:30 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Coles, Crawford, Edgar, Jasper	60 min
Jun 21, 4:32 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford, Jasper	58 min
Jun 21, 4:37 PM CDT	Flash Flood Warning	ILX	Clark, Clay, Cumberland, Jasper, Richland	3 hr
Jun 21, 4:46 PM CDT	Tornado Warning	ILX	Crawford, Jasper	25 min
Jun 21, 4:52 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Effingham, Jasper	53 min
Jun 21, 4:55 PM CDT	Flash Flood Warning	ILX	Clark, Crawford	3 hr
Jun 21, 4:56 PM CDT	Severe Thunderstorm Warning	ILX	Lawrence, Richland	64 min
Jun 21, 5:12 PM CDT	Tornado Warning	ILX	Clay, Richland	48 min
Jun 21, 5:20 PM CDT	Tornado Warning	ILX	Crawford, Lawrence	40 min
Jun 21, 5:21 PM CDT	Tornado Warning	ILX	Clay, Jasper	39 min
Jun 21, 5:27 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Jasper	63 min
Jun 21, 5:49 PM CDT	Tornado Warning	ILX	Lawrence, Richland	41 min
Jun 21, 5:52 PM CDT	Tornado Warning	ILX	Clay, Jasper, Richland	25 min
Jun 21, 5:58 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Jasper, Richland	62 min
Jun 21, 5:59 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Jasper, Lawrence, Richland	61 min
Jun 21, 6:11 PM CDT	Flash Flood Warning	ILX	Clay, Lawrence, Richland	104 min

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.