Strong monsoon thunderstorms caused wind damage in Yavapai County and some flash flooding in northern Coconino County.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FGZ wrote it up.
Strong monsoon thunderstorms caused wind damage in Yavapai County and some flash flooding in northern Coconino County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Flagstaff, AZ wrote its last area forecast discussion before the first event at Aug 24, 1:39 PM MST, 1 hour 15 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 139 PM MST Sun Aug 24 2025 .SYNOPSIS...Arizona remains under an active pattern where showers and thunderstorms are expected each day through mid week, before decreasing by Thursday into the weekend. Storms will be capable of producing heavy rain, frequent lightning, small hail, and gusty/erratic winds. Outside of precipitation chances, look for near to below normal temperatures each afternoon. && .DISCUSSION...High pressure centered over eastern Arizona today will gradually weaken and slide off to the southeast through mid week as weak troughing continues along the west coast. This southerly flow pattern will be favorable for continued moisture transport into our region - and elevated chances for daily showers and thunderstorms. The main hazards with storms will be locally heavy rain/flooding and lightning. However, with most unstable CAPE values approaching 1500-2000 J/kg in Yavapai County this afternoon and evening, there could also be a few strong/severe thunderstorms with gusty winds and hail greater than nickel size. So far this afternoon, the main storm development has been over and just north of higher terrain of Yavapai and Coconino counties where moisture values are highest and early day sun destabilized the atmosphere. Storm motions are slowly toward the north, with some backbuilding cells noted in the Prescott region. Look for this activity to continue into the evening, with more isolated showers or storms overnight tonight. With several days of elevated precipitable water values expected, we extended the Flash Flood Watch for the Dragon Bravo and White Sage fire scars through Tuesday to cover the period with highest chance of seeing heavy rain over this newly burned area. Daytime temperatures will be near to a few degrees below normal through Tuesday. Wednesday into next weekend - as the ridge continues shifting southeast and the west coast trough moves closer, precipitable water values begin to fall over northern and central Arizona. Enough moisture appears to remain Wednesday for scattered storms, but by Thursday into the weekend storms are looking more isolated (10-25% chances). Daytime highs remain a bit below normal Wednesday and Thursday before starting to rebound close to normal Friday into the weekend. && .AVIATION...Sunday 24/18Z through Monday 25/18Z...Mainly VFR conditions expected through the period, outside of brief MVFR conditions in heavier SHRA/TSRA. Expect chances for showers/storms through 03Z, with -SHRA possibly continuing overnight. Highest coverage of storms NW of a KPAN-KRQE line. Outside of gusty/erratic winds with storms, look for west-southwest winds 5-15 mph. OUTLOOK...Monday 25/18Z through Wednesday 27/18Z...VFR conditions will continue outside of MVFR ceilings/visibilities in heavier SHRA/TSRA. Look for daily chances for widespread showers/storms primarily between 18Z-03Z, with isolated to scattered showers and thunderstorms continuing both Monday and Tuesday nights. Gusty/erratic winds possible near storms, but look for south through west winds 5-15 mph otherwise. && .FIRE WEATHER...This afternoon through Tuesday...Daytime highs will gradually cool over the next several days as humidity increases and daily precipitation chances continue. Scattered to widespread showers/thunderstorms expected each afternoon and evening, with a chance of activity continuing during the overnight periods. Outside of gusty/erratic outflow driven winds, look for mostly southwest through west daytime winds 5-15 mph. Wednesday through Friday...Temperatures will remain below normal through the end of the week, with a gradual decrease in afternoon minimum RH values. Scattered showers and thunderstorms are expected Wednesday, becoming more isolated for Thursday and Friday. Outside of gusty/erratic outflow driven winds, look for mostly southwest through west daytime winds 5-15 mph. && .FGZ WATCHES/WARNINGS/ADVISORIES... Flood Watch through Tuesday evening for AZZ004>006. && PUBLIC...JJ AVIATION...JJ FIRE WEATHER...JJ For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 62 km away, was scanning. The volume nearest the first event began at 21:52 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Public reported seven power poles knocked down or snapped over Salt Mine Road due to strong downburst winds. Power was knocked out for a large area of Camp Verde. Salt Mine Road was closed for over 12 hours.
Antelope Canyon Tribal Park Service sent photos of water flowing through Antelope Canyon. High water marks indicated water depth of 1 to 2 feet prior to entering Antelope Canyon. Time is estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2025Every state in 2025This day in weather historyWarnings in Arizona, August 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1282512, 1282513.