I think this was the kind of monsoon mess that reminds everybody — again — that the Valley does not negotiate with weather. When storms dump more than 2 inches of rain in parts of east Mesa, knock out power, strand motorists and force a water rescue, that is not a gentle seasonal refresh. That is the desert collecting its debt.

The National Weather Service issued a flash flood warning for Maricopa County on Sept. 16, 2026, and the warning was set to expire at 4:45 p.m. The service also said thunderstorms were forecast to bring several inches of rain to parts of the Valley, with additional rainfall capable of worsening flooding on roads, underpasses and low-lying areas across the county. In other words, the storm was not just passing through for atmosphere. It was making a point.

Mesa took the hardest hit. According to the rainfall map from the Maricopa County Flood Control District, east Mesa saw the heaviest totals, largely above 2 inches, with areas near Thunder Mountain approaching 4 inches. North Scottsdale also saw significant rain, while other parts of the East Valley such as Tempe, Chandler and Gilbert reported little to no rainfall. The West Valley, for its part, got a much lighter soaking. That kind of uneven spread is classic monsoon behavior: one neighborhood gets a puddle, another gets a problem.

The fallout was immediate. Hundreds of Salt River Project customers appeared to be without power in Glendale, east Mesa and Gilbert, according to the utility’s online outage map, and a handful of Arizona Public Service customers also appeared to be without power in the region about 6 p.m. SRP said the outages were weather-related and crews were working to restore power. The Federal Aviation Administration also temporarily issued a ground stop at Phoenix Sky Harbor International Airport. Because apparently the storm wanted a full resume.

Mesa Community College at Red Mountain closed for the day because of the weather and flooding, and Mesa firefighters rescued a stranded motorist. That last detail matters, because the weather service has been blunt about what to do when floodwater shows up: turn around. Most flood-related deaths occur inside vehicles, it said, which is the sort of warning people tend to treat as optional right up until it is not.

By about 3:45 p.m., the National Weather Service said the mid-day downpour had largely concluded, but it warned that several bodies of water in the Phoenix area remained at high levels and could still flood. Cave Creek, Beardsley Canal, Agua Fria River, Deadman Wash, Skunk Creek, New River, North Canyon Creek and Apache Wash were all on that list.

So yes, this was a rough stretch for Mesa and parts of the Valley. But it was also a very familiar one: the monsoon arrives, the water comes fast, and the desert reminds us that “dry heat” is not a weather strategy. As ever, the smartest move is the least dramatic one — turn around, stay out of the water, and let the storm have the last word.

— Bill Farr