Holbrook, AZ —

What is happening: The National Weather Service in Flagstaff has issued a Severe Thunderstorm Warning for Navajo County in north central Arizona and Apache County in northeastern Arizona, in effect until 2:30 AM MST. At 2:07 AM MST, radar showed a severe thunderstorm 13 miles east of Sun Valley — about 20 miles east of Holbrook — moving north at 40 miles per hour.

Local impacts: The storm is producing quarter-size hail, and damage to vehicles is expected. The warning covers the Petrified Forest National Park area, including the park headquarters and wilderness area, plus Interstate 40 between mile markers 304 and 316. Torrential rainfall with this storm may also lead to flash flooding.

What to do:

- Get inside a well-built structure and stay away from windows — this storm is capable of producing large hail.

- Never drive through flooded roadways; turn around, don't drown.

- Keep up with the latest warnings from the National Weather Service.

Source: National Weather Service Flagstaff, Arizona, October 22, 2026.