Highlights
- The National Weather Service in Phoenix issued a Flash Flood Warning for Maricopa and Pinal counties effective 11:11 p.m. Aug. 23 through 2:15 a.m. Aug. 24.
- Between 0.75 and 1.25 inches of rain had already fallen, with up to 0.5 inches more possible; flash flooding was already occurring at issuance.
- AZ Route 238 between mile markers 20 and 29 and Waterman Wash are specifically identified as affected locations.
- NWS urges drivers to turn around rather than attempt flooded roads, noting most flood deaths occur in vehicles.
FLASH FLOOD WARNING: The National Weather Service in Phoenix issued a Flash Flood Warning for Maricopa County and Pinal County at 11:11 p.m. MST Sunday, Aug. 23, valid through 2:15 a.m. MST Monday, Aug. 24, according to the NWS active alert.
Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.75 and 1.25 inches of rain had fallen at the time of issuance, with additional rainfall of up to 0.5 inches possible. The NWS rated the event severe, noting that flash flooding was already occurring.
The warning identifies life-threatening flash flooding of creeks and streams, urban areas, highways, streets, and underpasses as the primary hazard. Specifically named locations include the community of Mobile, AZ Route 238 between mile markers 20 and 29, West Prong Waterman Wash, and Waterman Wash.
NWS advises anyone encountering flooded roads to turn around, stating that most flood deaths occur in vehicles. Residents who observe flooding are asked to report it to local emergency services or law enforcement and request that information be relayed to the National Weather Service.
The warning expires at 2:15 a.m. MST; residents should monitor weather.gov/psr for updates or any extension of the warning.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- api.weather.gov retrieved 24/08/2026 06:14
Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 24/08/2026 06:14. Every claim traces to a source.
