Flash Flood Warning for Western Arapahoe and Northeastern Douglas Counties, CO
If you are in immediate danger, call emergency services now.
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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 Denver has issued a Flash Flood Warning for Western Arapahoe County and Northeastern Douglas County until 10:30 PM MDT.
The weather record, at a glance
- Record type
- Flash Flood Warning
- Affected area
- Northeastern Colorado
- Issued
- September 23, 2026
- Issuing authority
- NWS Denver CO
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: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Flash Flood Warning issued by NWS Denver CO. Effective from 2026-09-22T19:33:00-06:00 until 2026-09-22T22:30:00-06:00. Alert type code: FFW.
Affected Areas
Western Arapahoe County in northeastern Colorado and Northeastern Douglas County in northeastern Colorado. Specific locations include Eastern Centennial, eastern Highlands Ranch, northern Castle Rock, Parker, Greenwood Village, Lone Tree, Castle Pines, The Pinery, Foxfield and Cherry Creek Reservoir.
What You Should Do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Avoid excessive runoff areas including small creeks and streams, highways, streets, underpasses, drainage areas and other low lying spots.
Expected Conditions
Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain. Between 0.5 and 2 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly.
Timeline
The warning is effective immediately from 7:33 PM MDT on September 22, 2026, and remains in effect until 10:30 PM MDT on September 22, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Elsewhere in the country: similar length or severity timing 8
Beyond this NWS weather alert's own category, Areazine surfaces two nationwide peer sets: length-matched and severity/date-matched notices from elsewhere in the archive, distinct from the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,101 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 23, 2026.
Common Questions
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