Flood Warning Issued for Jefferson and St. Louis Counties in Missouri
This alert is no longer in effect.
NOAA issued it on May 7, 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 Jefferson and St. Louis counties in Missouri, with minor flooding expected on the Meramec River near Arnold starting Wednesday afternoon.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Jefferson and St. Louis Counties, Missouri
- Issued
- May 7, 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 Jefferson and St. Louis Counties, Missouri.
Flood Warning in Missouri
Alert Details
A Flood Warning has been issued by the National Weather Service (NWS) St Louis MO. It is effective from April 27, 2026, at 2:54 PM CDT.
Affected Areas
The warning affects Jefferson, MO and St. Louis, MO, specifically the Meramec River near Arnold.
What You Should Do
Motorists should not attempt to drive around barricades or drive cars through flooded areas.
Expected Conditions
Minor flooding is forecast, with the river expected to rise above the 24.0-foot flood stage to a crest of 28.7 feet early Friday afternoon.
Timeline
The warning is effective from April 27, 2026, with onset on April 29, 2026, at 4:45 PM CDT, and expires on April 29, 2026, at 3:00 AM CDT, though it may continue until further notice.
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 (774 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 7, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.