Isolated to scattered thunderstorms formed from Tucson westward during the evening producing severe winds gusts and property damage as well as flash flooding.
Every event with a place to put it. Tap one for its entry below.
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.
Isolated to scattered thunderstorms formed from Tucson westward during the evening producing severe winds gusts and property damage as well as 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 Sep 1, 2:38 PM MST, 1 hour 7 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 238 PM MST Sun Sep 1 2019 .SYNOPSIS...The favorable weather pattern for daily afternoon and evening thunderstorms will remain in place through the upcoming week. Expect temperatures to remain above average through the week. && .DISCUSSION...Scattered thunderstorms, some with hail, have been occurring this afternoon mainly across the western half of the forecast area on this first day of meteorological Fall. A few severe thunderstorm warnings and significant weather advisories have already been issued this afternoon. The area is under a favorable pattern today with the upper high centered near the four corners. The 12z Tucson sounding showed a rather brisk 15-25 kt mid-level steering flow which continues across the area this afternoon per the latest Doppler radar wind profile. PWAT values ranged from 0.70" across the White mountains to 1.3" over Tucson to 1.6" across western Pima county. Latest CAM runs indicated two areas of concern into the evening hours. One being across central/western Pima county where models show increasing upper level divergence this afternoon into this evening. With PWAT values over 1.5" wet microbursts are likely. The second area of concern into this evening is from Tucson north as thunderstorms move off the higher terrain. Outside of the severe potential, with SPC having the most of the area under marginal to slight risk, strong outflows will produce areas of blowing dust mainly west and northwest of Tucson. A Blowing Dust Advisory is in effect for these areas until 8 pm this evening. Favorable flow continues over the area on Labor Day with Pinal, Pima and Santa Cruz counties seeing the best chance for strong storms. Upper high will remain in a favorable position for the remainder of next week for continued daily rounds of isolated to scattered showers and thunderstorms. High temperatures for the first full week of September will see daily variations but for the most part will remain a bit above normal. && .AVIATION...Valid through 03/00Z. ISOLD-SCT TSRA/SHRA thru 02/06Z and then again aft 02/18Z. SCT clouds at 8k-12k ft MSL (locally BKN at 6k-9k ft MSL near TSRA) with BKN-OVC clouds AOA 20k ft MSL thru 02/06Z and aft 02/18Z, with diminishing clouds between 02/06Z and 02/18Z. Brief MVFR based on CIGS/VSBY from the stronger TSRA. Wind gusts to 45+ knots possible near TSRA. Otherwise, SFC wind generally less than 12 kts thru the forecast period and either variable in direction or favoring an ELY/SELY direction. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...A favorable flow regime combined with adequate moisture will result in the daily cycle of mainly afternoon and evening isolated to scattered showers and thunderstorms this weekend and into at least the middle of this week. Expect gusty and erratic winds with the stronger thunderstorms. Otherwise, 20-foot winds will be terrain driven and mainly under 15 mph. && .TWC WATCHES/WARNINGS/ADVISORIES... Blowing Dust Advisory until 8 PM MST this evening for AZZ501-502- 504-505. && Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
Special Weather Statement National Weather Service Tucson AZ 130 PM MST Sun Sep 1 2019 AZZ505-506-012115- Southeast Pinal County including Kearny/Mammoth/Oracle-South Central Pinal County including Eloy/Picacho Peak State Park- 130 PM MST Sun Sep 1 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PINAL COUNTY UNTIL 215 PM MST... At 129 PM MST, Doppler radar was tracking a strong thunderstorm 13 miles northwest of Saddlebrooke, or 8 miles northeast of Red Rock, moving west at 15 mph. Wind gusts of 50 mph and blowing dust will be possible with this storm. Locations impacted include... Eloy, Picacho, Picacho Peak State Park, Red Rock and Cactus Forest. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3251 11134 3267 11172 3299 11131 3262 11089 TIME...MOT...LOC 2029Z 093DEG 11KT 3265 11110 Zell
Special Weather Statement National Weather Service Tucson AZ 148 PM MST Sun Sep 1 2019 AZZ502>504-515-012145- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak-Tucson Metro Area including Tucson/Green Valley/Marana/Vail- 148 PM MST Sun Sep 1 2019 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIMA COUNTY UNTIL 245 PM MST... At 147 PM MST, Doppler radar was tracking a strong thunderstorm near Three Points moving west at 15 mph. Wind gusts of 50 mph and blowing dust will be possible with this storm. Locations impacted include... Three Points, Kitt Peak, San Pedro and Pan Tak. LAT...LON 3210 11121 3191 11129 3196 11169 3224 11156 TIME...MOT...LOC 2047Z 106DEG 13KT 3202 11135
Special Weather Statement National Weather Service Tucson AZ 232 PM MST Sun Sep 1 2019 AZZ502-503-515-012230- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak- 232 PM MST Sun Sep 1 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PIMA COUNTY UNTIL 330 PM MST... At 230 PM MST, Doppler radar was tracking a strong thunderstorm near Topawa, or 11 miles southeast of Sells, moving west at 15 mph. Other storms continued to develop south of Sells. Half inch hail and wind gusts up to 50 mph will be possible with these storms, along with heavy rain. Locations impacted include... Sells, Topawa, San Miguel, Ali Chukson, Vamori, Cowlic, Fresnal, Choulic, Newfield, Sasabe, Fresnal Canyon, Artesia, South Komelik. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 3173 11234 3204 11209 3189 11148 3143 11138 TIME...MOT...LOC 2130Z 088DEG 16KT 3178 11177 Meyer
Special Weather Statement National Weather Service Tucson AZ 240 PM MST Sun Sep 1 2019 AZZ502-504-012230- Tohono O'odham Nation including Sells-Tucson Metro Area including Tucson/Green Valley/Marana/Vail- 240 PM MST Sun Sep 1 2019 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL PIMA COUNTY UNTIL 330 PM MST... At 240 PM MST, Doppler radar was tracking a strong thunderstorm near Saguaro National Park West, or 14 miles south of Marana, moving west at 10 mph. Half inch hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Saguaro National Park West, Valencia West, Tucson Estates, Picture Rocks, Queens Well, Sil Nakya and Ryan AirField. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 3229 11112 3210 11111 3214 11188 3241 11177 TIME...MOT...LOC 2140Z 095DEG 10KT 3221 11122 GL
Special Weather Statement
National Weather Service Tucson AZ
325 PM MST Sun Sep 1 2019
AZZ509-510-012300-
Upper Gila River and Aravaipa Valleys including Clifton/Safford-White
Mountains of Graham and Greenlee Counties including Hannagan Meadow-
325 PM MST Sun Sep 1 2019
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GREENLEE COUNTY UNTIL
400 PM MST...
At 324 PM MST, Doppler radar was tracking a strong thunderstorm near
Hannagan Meadow moving southwest at 30 mph.
Dime size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Hannagan Meadow, Blue and Rose Peak.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3318 10906 3319 10947 3371 10945 3371 10941
3373 10938 3373 10935 3375 10936 3378 10935
3378 10905
TIME...MOT...LOC 2224Z 052DEG 28KT 3366 10921Special Weather Statement National Weather Service Tucson AZ 332 PM MST Sun Sep 1 2019 AZZ502-012315- Tohono O'odham Nation including Sells- 332 PM MST Sun Sep 1 2019 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIMA COUNTY UNTIL 415 PM MST... At 332 PM MST, Doppler radar was tracking a strong thunderstorm 15 miles east of Pisinemo, or 16 miles northwest of Sells, moving west at 20 mph. Nickel size hail and wind gusts of 50 mph and blowing dust will be possible with this storm. Locations impacted include... Pisinemo, Covered Wells, No:ligk, Cababi, San Luis - Sells District, Mountain Village and Rincon. LAT...LON 3221 11189 3197 11189 3194 11234 3223 11234 TIME...MOT...LOC 2232Z 088DEG 16KT 3209 11207 GL
The Tucson radar (KEMX), 182 km away, was scanning. The volume nearest the first event began at 22:44 UTC.
2 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Two power poles were downed in Ali Chugk.
Thunderstorm winds progressed northwest across western Pima County to the south and west of Ajo. A station 16 miles west of Ajo measured a wind gust to 60 mph.
Lickskillet Lane and Michelob Rd were flooded in Avra Valley. There was a report of 3.87 inches of rainfall in the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2019Every state in 2019This day in weather historyWarnings in Arizona, September 2019
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: 855914, 856775, 855915.