Scattered thunderstorms moved slowly southwest across southeast Arizona with one causing flash flooding that trapped several people at Tanque Verde Falls.
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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.
Scattered thunderstorms moved slowly southwest across southeast Arizona with one causing flash flooding that trapped several people at Tanque Verde Falls.
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 1, 3:23 PM MST, 3 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 323 PM MST Tue Aug 1 2017 .SYNOPSIS...The weather pattern will remain favorable for daily thunderstorms most days into the weekend. There should be a bit of a downtrend in activity early next week as the air mass dries a bit. With the moisture, high temperatures will generally be near or below average through Sunday. && .DISCUSSION...Convection thus far has been rather subdued this afternoon thanks in large part to the mid level warming observed on the 18Z sounding and a lack of sunshine across much of the area earlier in the day. The best storms will be across eastern areas where the sun has been out the longest and the mid level warming not as significant. For the overnight hours, convective allowing Hires models continue to suggest showers and isolated thunderstorms are expected much of the night with a possible uptick around dawn. For Wednesday, likely looking at an up day for a good part of the area with plenty of moisture, respectable instability and a low level forcing feature if we have enough sunshine. We should have a N/S boundary across the forecast area thanks to the easterly flow across NM into eastern AZ and the typical westerly flow in the west. Where they meet will be the fun zone which at this time looks like the central area including Nogales and Tucson. I tweaked pops up a bit this area with that in mind but this may be adjusted east or west a bit by morning. At this time Thursday looks to be a slightly better than average day around the region as has been the case since way back when. Friday into the weekend the flow aloft changes to southwesterly as an upper low settles in over California. This will change the character of the monsoon resulting in less of a threat for flooding and more of a severe weather threat each afternoon. Then early next week models continue the trend of a portion of the upper high setting up overhead which will help shut off the moisture flow into the region and suppress convection for overall warmer and drier conditions. Since the trend has remained in the model world the last few runs, I tweaked pops and clouds back a bit and left the high temperatures as they were, slightly warmer than average. Cerniglia && .AVIATION...Valid thru 03/00Z. SCT clouds 6-9k ft and SCT-BKN clouds above 10k ft AGL with isold to sct TSRA/SHRA into the evening. Brief MVFR cigs/vsbys psbl in/near TSRA. SFC wind vrbl in direction mainly less than 12 kts, except in the vcnty of TSRA where gusts may exceed 40 kts. Another round of sctd TSRA after 02/19z. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Fire weather concerns will remain low into next week thanks to elevated humidity levels and daily showers and thunderstorms across most of southeast Arizona. Daytime temperatures will generally be at or below normal through the weekend and a bit warmer thereafter. Outside of gusty thunderstorm winds, expect 20-foot winds to remain at or below 15 mph and follow typical upslope/down valley diurnal patterns. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && PUBLIC...Cerniglia AVIATION....Cerniglia FIRE WEATHER...Cerniglia Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
Special Weather Statement National Weather Service Tucson AZ 318 PM MST TUE AUG 1 2017 AZZ509-510-012315- Upper Gila River and Aravaipa Valleys including Clifton/Safford-White Mountains of Graham and Greenlee Counties including Hannagan Meadow- 318 PM MST TUE AUG 1 2017 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GRAHAM AND SOUTHERN GREENLEE COUNTIES UNTIL 415 PM MST... At 317 PM MST, Doppler radar was tracking a strong thunderstorm 13 miles south of Clifton, or 24 miles east of Safford, moving northwest at 35 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Safford, Clifton, Morenci, Thatcher, Pima, Solomon and Guthrie. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. LAT...LON 3278 10909 3258 10929 3293 11003 3334 10959 TIME...MOT...LOC 2217Z 138DEG 31KT 3283 10928 LEINS
Special Weather Statement National Weather Service Tucson AZ 527 PM MST TUE AUG 1 2017 AZZ506-507-509-511-020130- Upper Gila River and Aravaipa Valleys including Clifton/Safford-Southeast Pinal County including Kearny/Mammoth/Oracle-Upper San Pedro River Valley including Sierra Vista/Benson-Galiuro and Pinaleno Mountains including Mount Graham- 527 PM MST TUE AUG 1 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PINAL COUNTY UNTIL 630 PM MST... At 527 PM MST, Doppler radar was tracking a strong thunderstorm 7 miles east of San Manuel, or 28 miles southeast of Winkelman, moving northwest at 20 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Mammoth, San Manuel, Oracle, Aravaipa Creek Preserve and Dudleyville. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. LAT...LON 3267 11030 3251 11051 3269 11088 3297 11065 TIME...MOT...LOC 0027Z 126DEG 16KT 3263 11051 LEINS
The Tucson radar (KEMX), 40 km away, was scanning. The volume nearest the first event began at 01:28 UTC.
1 flash flood. Local standard time, as filed.
Three people were trapped at Tanque Verde Falls and unable to cross the wash to exit the area due to a rapid increase in water levels.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2017Every state in 2017This day in weather historyWarnings in Arizona, August 2017
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: 718268.