Overview
- Severe thunderstorms moved into the Phoenix Valley late Sunday into Monday, prompting NWS severe thunderstorm warnings for hail and damaging wind gusts and leaving a Flood/Flash Flood Watch in place across much of Arizona.
- Utilities reported multiple-thousand customer outages as storms knocked down lines and equipment, and APS and SRP crews worked overnight to restore power to affected neighborhoods.
- Local emergency officials warned that fast‑moving storms can produce sudden flash flooding, dangerous driving conditions, blowing dust, lightning, and interruptions to water or gas service, and they urged residents to avoid flooded roadways and downed power lines.
- Monsoon moisture has cooled daytime highs into the 90s for now, forecasts show storm chances easing through midweek but potentially increasing again by Thursday into the Labor Day weekend.
- The events reflect how Arizona’s monsoon season creates intense, highly localized storms that can change quickly, and agencies recommend basic preparedness such as emergency supplies, a plan for power loss, and following 'turn around, don’t drown' guidance.