Flagstaff, Arizona – Thunderstorms are poised to roll into northern Arizona by Thursday morning, bringing gusty winds, lightning, and heavy downpours that could disrupt travel on I-17 and local roads through Flagstaff.
According to the National Weather Service, storm chances begin before 8 a.m. Thursday, with the strongest cells developing between 8 a.m. and 11 a.m. Southwest winds up to 15 mph could accompany the storms, with isolated flooding possible in low-lying areas. The high will reach around 78°F. Motorists should prepare for sudden visibility drops and avoid driving through water-covered roads.
Storms continue Thursday night, especially before 11 p.m., before tapering off into a drier Friday. Friday will be partly sunny and warmer, with more storms developing between 11 a.m. and 5 p.m. Those could bring another round of afternoon lightning and brief downpours, especially east of I-17. Winds will remain gusty, with highs near 82°F.
Looking ahead, the weekend turns mostly dry and warmer. Saturday and Sunday highs rise to the mid-80s, with just a 20% storm chance Saturday afternoon. By Monday, monsoon moisture returns with increased chances of storms through Tuesday, especially in the afternoons and evenings.
Stay weather-aware through Friday, and prepare now for possible delays on area highways. NWS advisories may be issued if rainfall rates increase.
🌤️ Five-Day Forecast: Flagstaff, AZ
- Thursday, July 17: Thunderstorms likely before noon. High near 78°F. SW wind 5–15 mph.
- Friday, July 18: Thunderstorms after 11 a.m. High near 82°F. Gusts up to 17 mph.
- Saturday, July 19: 20% storm chance after 11 a.m. Mostly sunny. High near 86°F.
- Sunday, July 20: Dry and sunny. High near 85°F. Low near 55°F.
- Monday, July 21: Storms possible after 11 a.m. High near 84°F. Breezy.
- Tuesday, July 22: Storms possible after noon. High near 84°F. Gusts up to 21 mph.
