The National Weather Service issued a Flood Advisory for Maricopa County at 12:52 AM MST on August 20, effective until 3:45 AM MST. Heavy rain from thunderstorms has already dropped 0.75 to 1.5 inches across the area, with an additional 0.25 to 0.75 inches expected. Minor flooding is ongoing or expected to begin shortly in low-lying and poorly drained areas.
Affected locations include Phoenix, Mesa, Chandler, Tempe, Downtown Scottsdale, Downtown Mesa, Arizona State University, and several shopping centers and parks. The National Weather Service advises residents to avoid driving through flooded roads; most flood deaths occur in vehicles. Exercise extra caution at night when flood dangers are harder to recognize.
Source: National Weather Service.
Sources
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- National Weather Service retrieved 20/08/2026 07:55
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 20/08/2026 07:55. Every claim traces to a source.
