Residual monsoon moisture and mostly sunny conditions in the morning allowed for a few thunderstorms to form over northern Arizona.
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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.
Residual monsoon moisture and mostly sunny conditions in the morning allowed for a few thunderstorms to form over northern Arizona.
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 1, 9:40 AM MST, 4 hours 41 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 940 AM MST Mon Aug 1 2022 .SYNOPSIS...Expect a warming trend for the start of this week, with a decrease in shower and thunderstorm activity. Storm activity will increase once again toward the end of this week, with the Flash Flood concerns returning to the forecast by Thursday. && .UPDATE...A nice and quiet morning across northern Arizona with very little cloud cover to be seen which is different than what we have been seeing lately. A less subdued day is forecast with storms firing along the Mogollon Rim and towards the White Mountains by early afternoon. This mornings sounding was a little more unstable than expected so anticipate that we may still have a fairly active day, though it should be less widespread than it has been of late. Made some updates to the PoPs and sky grids but other than that, the forecast looks to be on track. && .PREV DISCUSSION /313 AM MST/...Mid-level high pressure will shift westward for the next few days, bringing a more stable airmass to the region and temporarily cutting off the deep moisture flow from the Gulf of California. This will limit thunderstorm development through about Wednesday, with the more active areas being on the periphery of the mid-level high, leaving mainly isolated to scattered activity in this CWA. This also means a corresponding rise in daytime high temperatures, with at least a 5-10 degree jump, compared to last weekend. By Thursday and beyond, the high shifts back eastward and the door is opened for a moist and unstable airmass, once again. Expect an uptick in activity during this time frame. && AVIATION...For the 18Z TAF package...Mainly VFR conditions expected with light winds. Isolated to scattered showers and thunderstorms are anticipated this afternoon through 06Z Tuesday. Gusty, erratic winds and periods of MVFR VIS and CIGS are possible in and near thunderstorms. Aviation discussion not updated for TAF amendments. && FIRE WEATHER...Isolated to scattered storms today and Tuesday. Heavy rain and localized flash flooding continue to be the main threats. Expect a warming trend, light winds and high humidity both days. Gusty, erratic winds in and near storms. Wednesday through Friday...The warming trend continues for Wednesday with isolated showers and thunderstorms. Cooler temperatures and more widespread storms expected Thursday and Friday. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...Meola/Peterson AVIATION...LaGuardia FIRE WEATHER...Kobold For Northern Arizona weather information visit weather.gov/flagstaff
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1253 PM MST MON AUG 1 2022
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0629 PM FLASH FLOOD 12 NNW ASH FORK 35.39N 112.54W
07/31/2022 COCONINO AZ PUBLIC
LOCATION IS APPROXIMATE. FS 142 WASHED OUT
DUE TO FLASH FLOODING. RECEIVED VIA PRIVATE
MESSAGE.
&&
MMGThe Flagstaff radar (KFSX), 116 km away, was scanning. The volume nearest the first event began at 21:22 UTC.
1 flash flood, 1 heavy rain. Local standard time, as filed.
The river gauge in Granite Creek at Prescott measured a rise from 7.08 feet to 9.51 feet in about 30 minutes.
Heavy rain caused several inches of water to flow across the road at Cosnino Road and Wapiti Trail. Dime sized hail was also reported during the heavy rain.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2022Every state in 2022This day in weather historyWarnings in Arizona, August 2022
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: 1052146, 1052147.