Thunderstorms moved westward into the Tucson Metro area the afternoon and evening of September 6th bringing flash flooding of multiple washes having at least 6 inches of moving water. Additionally, the thunderstorm winds caused multiple power poles to be downed causing a power outage on the west side of the Tucson Metro.
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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 moved westward into the Tucson Metro area the afternoon and evening of September 6th bringing flash flooding of multiple washes having at least 6 inches of moving water. Additionally, the thunderstorm winds caused multiple power poles to be downed causing a power outage on the west side of the Tucson Metro.
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 Sep 6, 2:48 PM MST, 3 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 248 PM MST Sat Sep 6 2025 .SYNOPSIS...Widely scattered showers and thunderstorms this evening with the main threat from these storms being areas of locally heavy rain producing isolated flash flooding. Below normal temperatures this weekend. Drying trend commences Sunday with only slight chances of precipitation, then dry early next week. Some moisture mid to late week will result in slight chances for showers and thunderstorms mid to late week. Most of the week will have near normal temperatures. && .DISCUSSION...Satellite imagery this afternoon showed extensive cumulus field with isolated areas of TCU and CBs. Any showers or thunderstorms that have developed so far this afternoon, as of this writing, have mostly occurred across Santa Cruz county. No change from the morning update with main focus area later this afternoon into this evening for scattered showers and thunderstorms that may produce localized heavy rain and increase flash flood risk will be across Santa Cruz county and southern half of the Tohono O'odham nation. The 06/12z HREF neighborhood probabilities has this area with 50-70% chance for 1" rain and 10% chance of 3" rain. Sunday: Ridging aloft combined with drying trend will limited mainly isolated thunderstorms across Cochise, Santa Cruz and central/western Pima counties. Highs 3 to 5 degrees warmer than today. Monday/Tuesday: Increased southwest flow aloft out ahead of a Pacific upper level trof will scour out deeper moisture and leave most of the area high and dry with high temperatures at or a few degrees above normal. Wednesday thru Friday: As the above mentioned upper level trof moves into the west coast, flow aloft turns southerly allowing some deeper moisture advecting north, mainly across the eastern half of the forecast area. Thus PoPs mainly in the 10% to 30% range from Tucson east. Near normal high temperatures each day. && .AVIATION...Valid through 08/00Z. SCT-BKN 6k-10k ft AGL. ISOLD to SCT SHRA/TSRA thru 07/06Z. Expect wind gusts up to 40 kts with the strongest storms. Surface winds less than 10 kts and variable outside any thunderstorm activity. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Minimum relative humidities 25 to 40 percent through the weekend, lowering to 15 to 30 percent much of next week. Widely scattered showers and thunderstorm chances this evening, then drier air Sunday with just enough moisture for a slight chance of showers and thunderstorms. Dry conditions prevail Monday and Tuesday, with slight chances of showers and thunderstorms mainly east of Tucson mid to late week as some moisture returns. Surface winds mainly light through the forecast period, except gusty and erratic in or near any thunderstorms. High temperatures will be below normal this weekend then warming back to seasonable levels for most of the week. && .TWC WATCHES/WARNINGS/ADVISORIES...None. && Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The Tucson radar (KEMX), 59 km away, was scanning. The volume nearest the first event began at 01:43 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Report of power poles down near San Joaquin Rd and Neal Ave due to thunderstorm wind gusts.
Heavy rainfall from thunderstorm heavy rainfall caused several washes to flow along South San Joaquin Road between West Milkyway Drive and Bopp Road with at least 6 inches of water and debris along the road.
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, September 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: 1294954, 1294953.