Flood Warning Issued for Madison, IL and St. Charles, MO
This alert is no longer in effect.
NOAA issued it on May 10, 2026, 3 months 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.
The National Weather Service has issued a Flood Warning for Madison, IL and St. Charles, MO, due to expected minor flooding on the Mississippi River at Alton from late Wednesday night to Sunday morning.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- St. Louis Region
- Issued
- May 10, 2026
- Issuing authority
- NWS St Louis MO
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 months ago; use the issuing agency's live warning service for current conditions in St. Louis Region.
Alert Details
The National Weather Service (NWS) St Louis MO has issued a Flood Warning. This alert is effective from April 30, 2026, at 3:00 AM CDT until May 3, 2026, at 7:00 AM CDT.
Affected Areas
The warning affects Madison, IL and St. Charles, MO, specifically including the Mississippi River at Alton, as well as other areas such as the Mississippi River near Herculaneum and at St. Louis.
What You Should Do
Residents should turn around and not drive through flooded roads, as most flood deaths occur in vehicles. Be especially cautious at night when flooding dangers are harder to recognize.
Expected Conditions
Minor flooding is forecast, with the river stage expected to rise above the flood stage of 21.0 feet early Thursday morning to a crest of 21.5 feet Thursday evening. At 11:00 AM CDT Tuesday, the stage was 18.2 feet.
Timeline
The alert is effective from April 30, 2026, at 3:00 AM CDT, and ends on May 3, 2026, at 7:00 AM CDT. It was sent on April 28, 2026, at 11:38 AM CDT and expires on April 29, 2026, at 11:45 PM CDT.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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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 (1,058 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 10, 2026.
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