Flagstaff, Ariz. –Thunderstorms could turn the start of September into a hazardous one for northern Arizona as lightning, heavy rain, and possible flooding threaten Flagstaff on Thursday. Drivers on Interstate 40 should prepare for sudden downpours and slick roads during the morning and afternoon hours.
According to the National Weather Service in Flagstaff, storm chances rise sharply Thursday morning with the highest risk between 11 a.m. and 5 p.m. Gusty winds and localized flooding remain possible. Commuters and residents are urged to allow extra travel time and avoid low-lying roadways during peak storm activity.
Storm activity eases by Thursday night, but another round of showers and thunderstorms is likely Friday. Saturday brings scattered storms during the day, with drier conditions returning by Sunday. Weekend outdoor plans may be affected, especially Friday evening events. Officials urge anyone attending football games or outdoor gatherings to monitor the skies and have shelter nearby.
Local impacts may include minor flooding in washes and reduced visibility on U.S. Highway 180 north of Flagstaff. Residents are encouraged to secure outdoor items, keep phones charged, and check travel conditions before heading out.
More thunderstorms remain possible through Saturday before calmer weather settles in by early next week. Residents should expect updates if additional advisories are issued.
Five-Day Forecast for Flagstaff, AZ:
- Thursday: High near 76. Thunderstorms likely after 11 a.m. Chance of rain 60%. Low around 50.
- Friday: High near 73. Showers and thunderstorms likely, mainly 11 a.m.–5 p.m. Chance of rain 70%. Low around 49.
- Saturday: High near 73. A 50% chance of storms, mainly afternoon. Low around 48.
- Sunday: High near 78. Sunny with slight afternoon storm chance. Low near 48.
- Monday: High near 78. Mostly clear, calmer winds. Low around 47.
