Flood Warning Issued for Sangamon River in Cass and Mason Counties, IL
This alert is no longer in effect.
NOAA issued it on July 27, 2026, 3 weeks ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Lincoln IL has issued a Flood Warning for the Sangamon River near Chandlerville affecting Cass and Mason Counties from late Monday night to Friday morning.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Cass and Mason Counties, Illinois
- Issued
- July 27, 2026
- Issuing authority
- NWS Lincoln IL
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: historical. It was issued 3 weeks ago; use the issuing agency's live warning service for current conditions in Cass and Mason Counties, Illinois.
Alert Details
Flood Warning issued by NWS Lincoln IL. Effective from 2026-06-20T19:14:00-05:00. Onset 2026-06-23T05:30:00-05:00. Expires 2026-06-21T11:15:00-05:00. Ends 2026-06-26T07:00:00-05:00.
Affected Areas
Sangamon River near Chandlerville affecting Mason and Cass Counties in Illinois.
What You Should Do
Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation.
Expected Conditions
Minor flooding is forecast. At 7:00 PM CDT Saturday the stage was 455.1 feet. The river is expected to rise above flood stage early Tuesday morning to a crest of 457.4 feet early Wednesday morning. Flood stage is 456.6 feet.
Timeline
From late Monday night to Friday morning.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (811 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to July 27, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.