NWS Flagstaff AZFF.W 0151September 12, 2026
Flash Flood Warning: Coconino, AZ
The National Weather Service office in Flagstaff issued a flash flood warning for Coconino in Arizona, which was in force until 5:30 p.m. local time on September 12. It was the 151st flash flood warning the NWS office in Flagstaff issued in 2026. Arizona had 145 flash flood warnings in September 2026, against 41 in an average September of 2008-2025 (Arizona's flash flood warnings by year).
ExpiredWarning
In force for 2.9 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Flagstaff AZ
- Area
- Coconino
- State
- Arizona
- Level
- Warning
- Issued
- 2:36 p.m. PDT, September 12, 2026
- Expires
- 5:30 p.m. PDT, September 12, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KFGZ FF.W 0151
- Official source
- National Weather Service: the notice at its source
Flash Flood Warnings in Arizona since 2008Every warning type in Arizona
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
FFWFGZ The National Weather Service in Flagstaff has issued a * Flash Flood Warning for... Coconino County in north central Arizona... * Until 530 PM MST /630 PM MDT/. * At 236 PM MST /336 PM MDT/, Doppler radar indicated thunderstorms producing heavy rain across the warned area, along and east of Highway 98 from 5 to 10 miles southeast of Page. Between 0.5 and 1 inch of rain has fallen. Additional rainfall amounts of 0.25 to 0.75 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, normally dry washes, highways, streets and underpasses. * Some locations that will experience flash flooding include... Mainly rural areas of Coconino County. This includes the following slot canyons... Starting Water Wash. This includes the following creeks, washes and rivers... Navajo Creek, Antelope Creek, Kaibito Creek, Starting Water Wash, Peach Wash and Sand Wash.
What the agency told people to do
Flooding of washes and creeks will occur, some dirt roads will become muddy and impassable. Paved roads and underpasses could become flooded as well. Low water crossings will become dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. Get out of washes and creeks if you are camping or hiking! Flooding is occurring or imminent and will inundate creeks and washes.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.