Flagstaff drivers should prepare for stormy conditions Sunday as thunderstorms target northern Arizona, raising flash flood concerns and slowing travel along I-40 and I-17. Heavy rain, gusty winds, and reduced visibility could cause dangerous conditions during the afternoon and evening hours.
According to the National Weather Service in Flagstaff, showers and thunderstorms are most likely between 11 a.m. and 5 p.m. Sunday, with rain continuing into the night. Some storms could bring small hail and localized flooding, especially in low-lying areas. Winds may gust up to 18 mph.
The unsettled weather will linger through early next week. Monday brings another strong chance for storms, with activity lasting into Tuesday evening. Flash flooding remains the biggest concern for canyons, washes, and burn scar areas. Officials urge residents to avoid crossing flooded roadways and to allow extra time for travel on I-40, U.S. 89, and I-17.
While daytime highs remain seasonable in the upper 70s to low 80s, storm coverage will keep conditions muggy and roads slick. Locals should secure outdoor items, charge devices, and prepare for possible power outages.
Storm chances decrease midweek, but scattered showers could return by Thursday. Conditions improve by Friday with partly sunny skies and warmer afternoon highs.
Weather alerts may be updated quickly, so residents are advised to monitor local forecasts and prepare for changing conditions through Tuesday.
Five Day Forecast for Flagstaff, AZ
- Sunday, Aug. 24: Thunderstorms likely, high 82°F, storms into evening.
- Monday: More storms likely, high 81°F.
- Tuesday: Showers and storms continue, high 77°F.
- Wednesday: Partly sunny, chance of storms, high 76°F.
- Thursday: Isolated showers, mostly sunny, high 76°F.
