Flood Warning Issued for Lyon and Osage Counties in Kansas
This alert is no longer in effect.
NOAA issued it on May 6, 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 Lyon and Osage Counties in Kansas, with moderate flooding expected on the Marais Des Cygnes River from this morning until late tomorrow morning.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Lyon and Osage Counties, Kansas
- Issued
- May 6, 2026
- Issuing authority
- NWS Topeka KS
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 Lyon and Osage Counties, Kansas.
Flood Warning in Kansas
Alert Details
A Flood Warning has been issued by the National Weather Service in Topeka KS. It is effective from April 27, 2026, at 7:11 AM CDT until April 28, 2026, at 9:00 AM CDT.
Affected Areas
The warning affects Lyon, KS and Osage, KS, specifically the Marais Des Cygnes River above Reading.
What You Should Do
Motorists should not attempt to drive around barricades or drive cars through flooded areas.
Expected Conditions
Moderate flooding is forecast. The river stage was 13.7 feet at 7:00 AM CDT, and it is expected to rise above the 19.0-foot flood stage to a crest of 23.3 feet this afternoon, then fall below flood stage this evening. Impacts include flooding of low-lying areas, overflow on the right bank in several swift channels over Road Y 5, 3 miles north of Reading.
Timeline
The alert is effective from April 27, 2026, at 7:11 AM CDT, with onset at 10:19 AM CDT. It expires on April 27, 2026, at 10:15 PM CDT and ends on April 28, 2026, at 9:00 AM CDT.
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 (1,018 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 6, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.