Thunderstorms across Cochise County and Santa Cruz County resulted in areas of flash flooding.
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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 TWC wrote it up.
Thunderstorms across Cochise County and Santa Cruz County resulted in areas of flash flooding.
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 Tucson, AZ wrote its last area forecast discussion before the first event at Aug 7, 1:04 PM MST, 5 hours 56 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 104 PM MST Wed Aug 7 2024 .SYNOPSIS...Scattered showers and thunderstorms each day into this weekend with the exception of Saturday which could see reduced coverage. Storms will have the potential for heavy rainfall and strong wind gusts. Temperatures cool to near normal levels today and Thursday, then warm up to above normal levels Friday through the weekend. && .DISCUSSION...Temperatures are 4-10 degrees less than this time yesterday thanks to the cloud cover in place over some of the CWA. The upper level low is now situated over western Sonora and the Gulf of California. Storms have already begun to form over the Huachucas, Mt Graham, and the White Mountains. Expect this activity to continue with storms mainly confined to the higher terrain from Tucson eastward over the next couple of hours with storms then moving into the lower deserts. Areas with lingering mid-level clouds such as Tucson could have a late start or struggle some with storm formation. However ingredients for storms are still in place with MLCAPE of 1000-2000 J/kg, PWAT ranging from 1.25"-1.75", and moderate 0-6 km shear of 15-20 kts. Storms will be capable of strong winds and heavy rainfall with heavy rainfall expected to be the bigger threat. DCAPE values are only around 700 J/kg. HREF rainfall probabilities are highlighting areas just south of the Tucson metro, Santa Cruz County, and western Cochise County for the greatest chance of heavy rainfall. Three hour probability matched mean for greater than 1" of QPF is 70 percent for these areas this afternoon and evening. Isolated amounts of 2" will also be possible. Storms will also be slower moving with steering flow around 5-10 knots, which will aid the heavy rain threat. CAMs aren't showing much if any nocturnal showers or thunderstorms which should leave Thursday with more insolation than today. Moisture and instability will be similar to today, so expect scattered thunderstorms mainly from central Pima County eastward during the afternoon and evening. The HREF favors eastern Pima County, Santa Cruz County, and Cochise County to be the most active. The upper level low will sit over the northern portion of the Gulf of California, which is a little further east than previous model runs and could slightly enhance the 500 mb flow. Storms will be capable of strong winds and heavy rainfall leading to localized flash flooding. The HREF is highlighting Cochise County to see the best chances for heavy rainfall with the 3 hour QPF PMM showing a 10 percent chance for 3 inches of rain and 70 percent for 1". Friday eastern areas begin to lose moisture, which could lead to reduced storm coverage especially if the atmosphere is worked over from Thursday's storms. But areas from Benson westward could still see storms. Temperatures also begin to increase as high pressure becomes centered over New Mexico. Saturday the upper level low moves west over Baja California and models further dry out southeast Arizona, which will lead to further reduced storm coverage. High temperatures will also increase to 4-7 degrees above normal. Sunday into early next week moisture returns to normal levels with daily afternoon and evening thunderstorms expected. Mid-week a possible pattern change looks to take place with a trough setting up on the West Coast. Ensembles still differ with how far south the trough extends which will determine whether southeast Arizona switches from southeasterly flow to drier southwesterly flow. && .AVIATION...Valid through 09/00Z. SCT-BKN clouds at 6k-9k ft AGL and BKN-OVC clouds AOA 15k ft AGL thru this evening then gradual clearing overnight into the morning. SCT SHRA/TSRA thru 08/03Z, slowly diminishing thereafter. MVFR conditions expected near TSRA, with VSBY restrictions, wind gusts to 40+ kts, heavy rain and mountain obscurations. Outside of thunderstorm wind gusts, wind speeds will be less than 12 kts, favoring an SWLY through NWLY direction in the afternoon and early evening hours and variable in direction at other times. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Isolated to scattered mainly afternoon and evening showers and thunderstorms are expected through the upcoming weekend with a possible down day Saturday. Min RH values will be in the 25-40 percent range in the valleys through Thursday (and higher in the mountains), decreasing to 20-30 percent Friday through the weekend. Outside of thunderstorm outflow winds, 20-foot winds will generally be 15 mph or less, with afternoon/early evening gusts to 20-25 mph and light winds overnight. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The Tucson radar (KEMX), 44 km away, was scanning. The volume nearest the first event began at 02:02 UTC.
2 flash flood. Local standard time, as filed.
Reports of flash flooding with running water over roadway at the intersection of Sopori Wash and W Arivaca Rd.
Reports of flash flooding on roadways and stranded vehicles near Washington Ave and Golf Course Road in Douglas. There was also a car stuck in flooded roadway at Primrose St and Washington Ave in Douglas.
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: 1211467, 1211463.