The center of an area of high pressure was located near the Four Corners, a near |perfect location for the monsoon moisture to continue spreading over northern Arizona. This brought the continuation of daily afternoon and evening showers and thunderstorms to the area.
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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.
The center of an area of high pressure was located near the Four Corners, a near |perfect location for the monsoon moisture to continue spreading over northern Arizona. This brought the continuation of daily afternoon and evening showers and thunderstorms to the area. The PWATs ranged from around 0.90-1.40, which is slightly above the climatological normals for early August.
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 4, 5:22 PM MST, 38 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 522 PM MST Sun Aug 4 2024 .SYNOPSIS...Monsoon continues with daily chances for showers and thunderstorms through the week. Temperatures will remain above normal, with light winds outside of storms. && .DISCUSSION...Storms fired early over higher terrain today, as expected. Convection now slowly working west and south, along outflows, as expected. Vertical development does not favor hail production, but isolated stronger cells may produce localized flooding. Nocturnal activity is unlikely. The strength of the high pressure center is a limiting factor for stronger storm development, especially for the northern zones. This will allow for some minor heat issues, mainly in areas that do not see rainfall, as we continue to remain above normal for the next few days. By Tuesday or Wednesday, a series of easterly waves and possible tropical activity over the Gulf of California will likely lower hghts, induce moisture surges and cause an increase in Monsoon activity. The Wednesday through Saturday time frame may be very active, stay tuned. && .AVIATION...Monday 05/00Z through Tuesday 06/00Z...ISOLD-SCT SHRA/TSRA through 03Z and then again 17Z-00Z especially over the higher terrain. Brief periods of MVFR conditions and gusty, erratic winds near +RA/TS. Otherwise, VFR conditions with SW winds 5-10 kts. OUTLOOK...Tuesday 06/00Z through Thursday 08/00Z...SCT SHRA/TSRA each day mainly 19Z-03Z. Brief periods of MVFR conditions and gusty, erratic winds near +RA/TS. Otherwise, VFR conditions are expected with winds W 5-10 kts each afternoon. && .FIRE WEATHER...Monday and Tuesday...Expect scattered showers and thunderstorms each afternoon and evening. Temperatures remain above average, with light winds outside of thunderstorm activity. Wednesday through Friday...Expect an uptick in activity during this period. Expect scattered to numerous afternoon and evening showers and thunderstorms each day. Daytime temperatures will drop a bit closer to normal, with light winds outside of thunderstorm activity. && .FGZ WATCHES/WARNINGS/ADVISORIES...None. && PUBLIC...Peterson AVIATION...MAS FIRE WEATHER...Peterson For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 71 km away, was scanning. The volume nearest the first event began at 01:02 UTC.
1 flash flood. Local standard time, as filed.
A USGS river gauge on Oak Creek in Sedana measured a two foot rise in 15 minutes from heavy rain near Munds Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2024Every state in 2024This day in weather historyWarnings in Arizona, August 2024
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: 1212972.