Flash Flood Warning Issued for Plymouth and Sioux Counties in Iowa
This alert is no longer in effect.
NOAA issued it on May 27, 2026, 2 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.
NWS Sioux Falls has issued a Flash Flood Warning for north central Plymouth County and south central Sioux County in northwestern Iowa until 11:15 PM CDT.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Northwestern Iowa
- Issued
- May 27, 2026
- Issuing authority
- NWS Sioux Falls SD
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 2 months ago; use the issuing agency's live warning service for current conditions in Northwestern Iowa.
Alert Details
Flash Flood Warning issued by NWS Sioux Falls SD. Effective from May 17 at 8:03 PM CDT until May 17 at 11:15 PM CDT. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
North Central Plymouth County and South Central Sioux County in northwestern Iowa. Specific locations include Le Mars, Maurice, Struble and Brunsville.
What You Should Do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Expected Conditions
Doppler radar indicated thunderstorms producing heavy rain. Between 2 and 3 inches of rain have fallen with additional rainfall amounts up to 1 inch possible. Flash flooding caused by thunderstorms.
Timeline
Alert effective May 17, 2026 at 8:03 PM CDT. Expires and ends May 17, 2026 at 11:15 PM 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 (807 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to May 27, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.