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| Antelope Canyon in Arizona, a slot canyon carved by flash flooding over thousands of years. This is a file photo, not a picture of this weekend's flooding. (Photo: Wikimedia Commons) |
In 60 seconds: A moisture-laden storm riding an atmospheric river is soaking an already saturated Southwest through Monday, with flood watches across nearly all of Arizona and a Moderate Risk of excessive rainfall for parts of the Four Corners region on Sunday — days after Friday's floods forced rescues in Phoenix, Scottsdale, and Henderson.
- As much as 4 inches of rain could fall across the Southwest through Monday, on ground already soaked by a deadly autumn of storms.
- The Weather Prediction Center issued a Moderate Risk — level 3 of 4 — of excessive rainfall for parts of the Four Corners region on Sunday, with widespread 3-inch totals expected north and east of Phoenix.
- Flood watches cover nearly all of Arizona plus parts of southern Utah, southwestern Colorado, western New Mexico, and southern Nevada.
- Friday's flooding already forced rescues in Phoenix and Scottsdale and three swift-water rescues in Henderson, Nevada, where one person pulled from a wash later died at a hospital after going into cardiac arrest.
- In Colorado, the San Juan River at Pagosa Springs is forecast to crest near 17 feet early Monday — approaching its flood of record.
Here's the thing about desert flooding: it doesn't take a hurricane. It takes rain falling on ground that can't absorb another drop — and right now, that's most of the Southwest.
What happened
Heavy rain starting Saturday evening, October 31, was expected to bring a flash-flood threat to saturated parts of the American Southwest through Monday, November 2, according to the National Weather Service. The Associated Press reported November 1 that as much as 4 inches of rain could fall across the region after a deadly autumn of soaking rains.
The danger isn't theoretical. On Friday, October 30, Phoenix firefighters rescued people from four vehicles on flooded streets, while crews in nearby Scottsdale pulled people from cars sitting in 3 to 4 feet of water. In Henderson, Nevada, crews conducted three swift-water rescues during a Friday downpour — and one person rescued from a wash later died at a hospital after going into cardiac arrest, a city spokesperson told media outlets. In Bullhead City, Friday's rain left water, rocks, and debris across streets and closed parks.
Latest verified facts
The National Weather Service has issued flood watches for nearly all of Arizona and parts of southern Utah, southwestern Colorado, western New Mexico, and southern Nevada. Those watches include the Four Corners region, where Arizona, Colorado, New Mexico, and Utah meet — an area forecasters say has been hit especially hard by recent rains.
The Weather Prediction Center in College Park, Maryland, issued a Moderate Risk of excessive rainfall — level 3 on its 4-level scale — for parts of the Four Corners region on Sunday, with the heaviest rain across central Arizona and the Mogollon Rim and widespread 3-inch totals north and east of Phoenix. The center noted that "all of this rainfall will convert to runoff due to already well-saturated soils."
Locally, the details matter. Flagstaff put northern and central Arizona under a watch from 11 p.m. Saturday through 5 a.m. Monday, forecasting 1 to 3 more inches — 4 to 6-plus on slopes facing the moisture — and warned the Little Colorado and Verde rivers "may be flooding for days after the event." The Phoenix-area watch runs Saturday evening through late Sunday night, with 1 to 2 more inches on already moist soil. Around Tucson, forecasters put the chance of more than 1 inch at 84% and more than 2 inches at 35%, with the San Francisco, Blue, and Gila rivers and Sabino Creek at risk of minor-to-major flood stages.
Why it matters
Weather Prediction Center meteorologist Allison Santorelli summed up the core problem: "It's not going to take much rainfall to be impactful at all in some of these locations just because of how saturated they are." When soil is saturated, rain has nowhere to go but downhill — into washes, streets, and rivers, fast.
That's also why the numbers that sound small are the ones that kill. Scottsdale fire Capt. Dave Folio said just 2 inches of moving water can "sweep your vehicle off its wheels" — and Friday's rescues involved cars in 3 to 4 feet of it. The standing advice applies with unusual force this weekend: never drive through flooded roads or walk into a wash that looks crossable. Most U.S. flood deaths happen in vehicles.
Impact on the USA and the world
This is a follow-up to Senate Wire's earlier coverage of Arizona's flood watches and the Election Day storm threat. The watches stretch statewide, and the rain reaches four states plus Nevada — meaning flooded low-water crossings, closed parks, and river roads that may stay shut for days.
The river forecasts tell the longer story. Beyond the flash-flood danger in cities and washes, the Little Colorado and Verde rivers could stay high for days after the rain stops. In Colorado, the Grand Junction office forecast major flooding on the San Juan River at Pagosa Springs from Sunday afternoon to Monday evening, cresting near 17.0 feet early Monday — approaching its flood of record, against a flood stage of just 10.5 feet.
What happens next
The peak runs Sunday into Monday evening. Watch three things: whether the Four Corners Moderate Risk verifies; whether the San Juan crests near 17 feet early Monday; and whether the Little Colorado and Verde stay in flood for days. Senate Wire will update if rescues, road closures, or river records are confirmed.
Our take: these numbers aren't extreme by hurricane standards, and that's exactly the trap. On saturated ground, an ordinary-looking 1 to 3 inches becomes a life-threatening flood. If you're under these watches, treat every flooded road as closed.
Read our earlier coverage: Arizona's Second Flood Watch Starts Tonight at 11 p.m. and Election Day Storm Could Make Voting Messier Across the Central US.
Sources
- Associated Press, via Bastille Post: "Heavy rains expected to bring flooding risk to already saturated parts of the US Southwest" (November 1, 2026)
- Weatherboy: "Atmospheric River Takes Aim at Waterlogged Arizona after Friday Flash Floods" (October 31, 2026, citing National Weather Service offices in Flagstaff, Phoenix, and Tucson and the Weather Prediction Center)
- National Weather Service / Weather Prediction Center excessive rainfall outlook for Sunday, November 1, 2026