Arizona got its first tornado watch in more than 15 years as storms hit Flagstaff

Arizona was placed under a tornado watch on Oct. 21, 2026, the first for the state in more than 15 years, and the National Weather Service office in Flagstaff said a few tornadoes, hail up to the size of a tennis ball and scattered gusts up to 70 mph were possible. Flagstaff itself was included in a tornado warning issued shortly after 9 a.m. that day. Northern Arizona is far more used to dry October mornings than to rotating supercells, which is why the alerts drew so much attention.

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The sequence unfolded on Wednesday, Oct. 21, with the first alerts arriving early in the morning. Multiple tornado warnings went out for parts of northern Arizona, and more followed later in the morning for portions of Yavapai and Coconino counties. Every one of them rested on radar-indicated rotation, meaning forecasters saw signs of spinning air inside a storm rather than a funnel confirmed on the ground. The watch covered northeastern, north and northwestern Arizona and ran until 6 p.m. MST.

What the first Arizona tornado watch in years actually covered

FOX Weather reported on Oct. 21 that the tornado watch was the first issued for Arizona in over 15 years, a figure its takeaway box gives as “over 15 years” and its body text puts at 16 years. Either way, the gap is long enough that most residents of the state had never seen the product. The same report said a tornado warning went out for part of Yavapai County on Wednesday morning, and that a severe thunderstorm watch blanketed the state alongside the tornado watch.

A tornado watch means conditions are favorable for tornadoes to form; a warning means rotation has been detected or a tornado is occurring. The distinction mattered here. According to azfamily.com, the NWS Flagstaff account announced that “a tornado watch has been issued for parts of Arizona until 6 PM MST,” and that Flagstaff and surrounding areas were then included in a warning shortly after 9 a.m.

The risk did not stop at the mountains. Azfamily.com described a slight risk of severe storms with tornadoes covering both Wednesday and Thursday, especially across the High Country, with the Valley also under a slight risk and hail and wind damage possible there. The station noted that the warnings near Flagstaff were based on radar-indicated rotation, not ground observation, and that Thursday’s storm chances remained high, including a continued threat of severe weather, before the forecast turned dry.

A Level 3 severe risk for Flagstaff and Prescott

The forecast behind the alerts was unusually aggressive for the season. FOX Weather’s forecasters placed Flagstaff and Prescott under a Level 3 of 5 severe weather risk for damaging hail, including egg-sized stones, and tornadoes. The outlet noted that a Level 3 threat had not occurred in central Arizona in October since NOAA moved to its five-tier scale in 2015. Phoenix, Glendale, Chandler and Scottsdale sat under a Level 2 severe threat, a step lower but still well above a typical October day in the Valley.

The weather service’s own Flagstaff page, which was updated at 3:54 p.m. MST on Oct. 21, described the same setup in more measured terms. It listed a flood watch for Wednesday and Thursday, expected rainfall of 1 to 3 inches with locally higher amounts, and possible severe storms with gusts over 60 mph, hail over 2 inches and a few tornadoes. Forecasters said the severe threat would peak Wednesday afternoon or evening, with storm chances easing from west to east on Thursday night.

Heavy rain behind the storms, and what comes after the watch

The rotation was only part of the story, because the same system was loading the state with water. FOX Weather described a strong West Coast storm moving into a humid air mass over Arizona on Wednesday afternoon, with a flood watch covering much of the state and parts of southern Utah, southwestern Colorado and western New Mexico through Thursday. AccuWeather meteorologist Kai Kerkow said the storm “will pull moisture from the tropics into the Southwest,” and the company’s Local StormMax for Wednesday and Thursday was 6 inches across Phoenix, Flagstaff and Tucson.

Rainfall rates were a concern in their own right. Weather.com reported that the Weather Prediction Center was forecasting rates as high as 2 inches per hour in the most intense cells, the kind of burst that can turn a dry wash into a fast-moving channel within minutes. Azfamily.com labeled Wednesday and Thursday First Alert Weather Days, with valley rain and storm chances near 40% in the morning and 60% by afternoon, and a drier pattern expected by Friday and into the weekend.

Forecasters tied the unusual October activity to a larger seasonal backdrop. FOX Weather noted that Arizona’s monsoon season typically runs from mid-June through September, so an event like this one falls outside the usual window, and it connected the activity to talk of a possible “Super El Niño” winter. The outlet added that the strong El Niño winters of 1997-98 and 2015-16 brought their severe outbreaks mainly to the Gulf Coast, the Southeast and the Southern Plains, not to the Southwest, which is part of what made Arizona’s Level 3 risk stand out.

None of the reports reviewed described a confirmed tornado touchdown in Arizona on Oct. 21. The watch, the Flagstaff warning and the rare Level 3 risk were all forecasts and radar signatures, and the damage that matters most may come from hail and flooding rather than wind.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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