Deep monsoon moisture allowed the formation of thunderstorms with heavy rain and flash flooding across 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.
Deep monsoon moisture allowed the formation of thunderstorms with heavy rain and flash flooding across 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 Jul 29, 8:32 PM MST, 5 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 832 PM MST Fri Jul 29 2022 .SYNOPSIS...An active monsoon pattern will continue through the weekend with scattered to widespread showers and thunderstorms expected. Beginning next week, a slight downward trend in thunderstorm coverage is expected. Flash flooding will remain the main threat during this time. && .UPDATE...Thunderstorm activity is winding down Friday evening, although the threat of flash flooding remains. Normally-dry washes and slot canyons are most vulnerable. Isolated spots across northern Arizona could still pick up additional heavy rainfall tonight. && .PREV DISCUSSION /237 PM MST/...Storms have begun to ramp up along I-40 near Flagstaff and throughout Yavapai County. Flash flooding is expected for areas in and around the Pipeline and Museum burn scar for the few hours. Widespread activity is expected to continue throughout the afternoon and evening hours. According to our 12Z sounding this morning, our PW values were just shy of an inch, so we still have plenty of moisture to tap into throughout the afternoon. Flooding and flash flooding will remain the biggest concerns for today. Be sure to have a way to check updates on current weather information, and check recent forecasts before traveling. Widespread thunderstorm activity is expected to continue on Saturday, thanks to the ridge remaining in place over the Pacific Northwest. This placement is allowing moisture to funnel up from the Gulf of California, which has been the primary source of moisture the last several days. Strongest storm development is forecast to begin after 11 AM MST and continue well into the afternoon/evening hours. Very similar to what has occurred throughout our CWA over the last several days. Aside from rainfall, temperatures will be slightly cooler than average for this time of year. Beginning late Sunday/early Monday, the high pressure system aforementioned will shift north of us toward the Plains. With the movement of this system, we're expecting a slight downward trend in monsoon activity. This downward trend will result in storm coverage becoming isolated to scattered across northern Arizona. Depending on where the high pressure system positions itself later next week (models currently are showing discrepancies in placement), we could see an increase in moisture into northern Arizona. && AVIATION...For the 06Z TAF package...Scattered showers and thunderstorms through 08Z, decreasing through the Saturday morning. Thunderstorms will increase in coverage after 16Z. Otherwise, mainly VFR conditions expected with light winds. Gusty, erratic winds and MVFR or lower conditions possible in and near thunderstorms. Aviation discussion not updated for TAF amendments. && FIRE WEATHER...Scattered to numerous storms Saturday and Sunday with flash flooding the main threat. Light winds, seasonally cool temperatures, and humid both days with gusty, erratic winds in and near storms. Monday through Wednesday...Daily showers and thunderstorms will continue with flash flooding as the main threat. && .FGZ WATCHES/WARNINGS/ADVISORIES... Flood Watch until 5 AM MST Saturday for AZZ004>018-037>040- 104>118-137>140. && PUBLIC...McCollum/BAJ AVIATION...Meola FIRE WEATHER...Meola For Northern Arizona weather information visit weather.gov/flagstaff
The Cedar City radar (KICX), 138 km away, was scanning. The volume nearest the first event began at 08:59 UTC.
4 flash flood. Local standard time, as filed.
Heavy rain in Utah caused a flash flood in the Paria River that drains into Arizona and the Colorado River near Lees Ferry. The river gauge near on the Paria River near the Colorado River peaked at 6.8 feet at 600 AM.
The river gauge on Granite Creek showed a rise of 2.55 feet in 90 minutes (at 1130 AM). Flooding was reported on Highway 69 near milepost 295.
Heavy rain over the Pipeline, Tunnel, and Schultz Fire scars caused flash flooding that closed Highway 89 in both directions from mile marker 426 to 434.
A video of flash flooding in Antelope Canyon was posted on social media.
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, July 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: 1050113, 1050110, 1050111, 1055483.