A strong instability plume set up across the southeastern half of AZ with MLCAPE values upwards of 1000 J/KG. Simultaneously, an upper-level trough moving across the Pacific Northwest resulted in a corridor of strong vertical ascent.
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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 PSR wrote it up.
A strong instability plume set up across the southeastern half of AZ with MLCAPE values upwards of 1000 J/KG. Simultaneously, an upper-level trough moving across the Pacific Northwest resulted in a corridor of strong vertical ascent. The combination of the available instability and upper-level forcing resulted in widespread thunderstorm development across southeast AZ with some of the activity moving into portions of southern Gila County, where heavy rainfall was observed across Gilson Wash, west of the San Carlos area. Doppler radar estimated rainfall amounts were in excess of an inch in less than hour, enough to result in water rises along Gilson Wash and flooding along the low-water crossings.
The Phoenix radar (KIWA), 103 km away, was scanning. The volume nearest the first event began at 02:16 UTC.
1 flash flood. Local standard time, as filed.
Mesonet stream gauge along Gilson Wash recorded an approximate 2.38 ft jump, impacting downstream low water crossings. No damages nor injuries were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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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 2026-10-01. Each event’s entry at NCEI: 1203078.