Scattered thunderstorms formed over the Tohono O'odham Nation west of Tucson and caused wind damage to several homes across three different communities.
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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 formed over the Tohono O'odham Nation west of Tucson and caused wind damage to several homes across three different communities.
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 Jul 21, 3:15 PM MST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 315 PM MST Sun Jul 21 2019 .SYNOPSIS...Isolated to scattered thunderstorms this afternoon and evening mainly south to west of Tucson. Ample moisture and favorable flow for scattered to numerous thunderstorms Monday afternoon into Monday night. Blowing dust due to thunderstorm gusts may occur Monday afternoon and evening. Scattered showers and thunderstorms to continue Tuesday into next weekend. && .DISCUSSION...Our large scale pattern is shaping up nicely with a strong ridge over the desert southwest and the high center consolidating near the 4-corners region to start the week. The surge we were discussing yesterday continues to increase in intensity with 12-20kts now up to 6k feet on the KYUX Vad Wind Profile. Surface dew points are up 5 to 15 degrees across the board with upper 50s and 60s pushing through Santa Cruz and Pima counties. Probably maintaining precipitable water values in the 1.5 inch range from Tucson westward, with up to 1.75 inches south of the border and 1.3 inches in eastern areas. Our main area of focus this afternoon is in the deeper moisture areas with a weak convergent area from northern Sonora through Santa Cruz county and the Tohono O'Odham Nation. Deeper moisture will continue to push into the area from the south tonight as we set up an easterly steering flow under the high. Tomorrow looks like our first widespread thunderstorm outbreak of the season. SREF plumes have ML CAPE around 1200 to 1500 tomorrow afternoon with HREF ensembles surface based CAPE in excess of 1500 J/kg. Effective vertical wind shear between 25 and 30 kts. UA WRF forecasts respond accordingly tomorrow with strong and organized thunderstorm development through the afternoon (and are doing well today). Perfect set-up for organized easterly outflow and blowing dust issues into the lower deserts. As mentioned before, Tuesday would likely be a recovery day if the Monday forecast works out. We'll see on that. We will still have plenty of boundary layer moisture to recycle the second half of next week, but are unlikely to maintain a deep fetch of moisture with an easterly component to our mid level flow periodically drying out (with limited Gulf of Mexico influence). However, with the high center finally in a position where it wobbles back and forth overhead to northwest to northeast of us, the overall trend will be better with up days and down days. && .AVIATION...Valid through 23/00Z. Scattered TSRA/SHRA along the international border this afternoon and evening. KOLS terminal will be the most affected. Isolated - TSRA/-SHRA for the rest of southeast Arizona. The bulk of any -TSRA/- SHRA should end around 06Z-08Z Monday, but isolated -TSRA/-SHRA may continue southeast to southwest of KTUS late tonight into early Monday morning. Scattered to numerous TSRA/SHRA expected Monday afternoon into Monday night. Brief wind gusts to 45-50 kts with the stronger TSRA. SCT-BKN cloud decks mainly 10k-15k ft MSL, except MFVR cigs and vis with storms with brief IFR conditions possible Monday afternoon. Surface wind this afternoon and evening mainly nwly 10-15 kts with gusts near 25 kts. Surface wind variable in direction mostly under 10 kts at other times. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Scattered thunderstorms and showers along the international border. Isolated showers and thunderstorms over the rest of southeast Arizona. Expect scattered to numerous thunderstorms Monday afternoon into Monday night. Adequate moisture will then persist Tuesday into next weekend for scattered mainly afternoon and evening thunderstorms. Gusty outflow winds expected near thunderstorms. 20-foot winds generally from the northwest under 15 mph but will transition to be out of the east to southeast Monday morning. Lowest minimum humidity is under 15 pct in the Gila River Valley today. Relative humidity unlikely to be under 20 percent anywhere for the rest of the week. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && Meyer/Pawlak Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
Special Weather Statement National Weather Service Tucson AZ 102 PM MST Sun Jul 21 2019 AZZ502-503-515-212045- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak- 102 PM MST Sun Jul 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIMA COUNTY UNTIL 145 PM MST... At 100 PM MST, Doppler radar was tracking a strong thunderstorm over Kitt Peak, or 16 miles east of Sells, moving northwest at 5 mph. Half inch hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... San Isidro, Kitt Peak and Pan Tak. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 3189 11147 3174 11161 3201 11173 3209 11151 TIME...MOT...LOC 2000Z 169DEG 5KT 3194 11159 Meyer
Special Weather Statement National Weather Service Tucson AZ 226 PM MST Sun Jul 21 2019 AZZ502-503-515-212215- Tohono O'odham Nation including Sells-Upper Santa Cruz River and Altar Valleys including Nogales-Baboquivari Mountains including Kitt Peak- 226 PM MST Sun Jul 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PIMA COUNTY UNTIL 315 PM MST... At 225 PM MST, Doppler radar was tracking a strong thunderstorm 12 miles northwest of Arivaca, or 24 miles west of Tubac, moving north at 5 mph. Half inch hail and winds in excess of 45 mph will be possible with this storm. Locations impacted include... Fresnal Canyon. 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 3167 11131 3153 11142 3180 11182 3187 11143 TIME...MOT...LOC 2125Z 166DEG 6KT 3173 11144 Meyer
Special Weather Statement National Weather Service Tucson AZ 335 PM MST Sun Jul 21 2019 AZZ503-212300- Upper Santa Cruz River and Altar Valleys including Nogales- 335 PM MST Sun Jul 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PIMA AND WESTERN SANTA CRUZ COUNTIES UNTIL 400 PM MST... At 335 PM MST, Doppler radar was tracking a strong thunderstorm near Arivaca, or 13 miles west of Tubac, moving west at 5 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Arivaca, Ruby and Arivaca Lake. LAT...LON 3167 11119 3146 11118 3145 11143 3172 11142 TIME...MOT...LOC 2235Z 090DEG 5KT 3156 11127 RH
The Phoenix radar (KIWA), 133 km away, was scanning. The volume nearest the first event began at 22:45 UTC.
3 thunderstorm wind. Local standard time, as filed.
Several homes suffered roof damage in Upper Covered Wells, Covered Wells, Lower Covered Wells, and Mountain Village.
Multiple homes suffered roof damage in Pisinemo, and the window was broken in 1 home. Two outbuildings were also damaged.
One home in Hickiwan suffered roof damage.
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, July 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: 842751, 842754, 842758.