Isolated severe storms developed over the high terrain east of Phoenix in the afternoon and progressed westward through Maricopa, Pinal, and parts of Yuma county through the evening. The storms produced damaging outflow winds as they progressed through southeast Phoenix which also led to the development of a dust storm south of Phoenix in dust prone areas. The outflow and dust pushed into Yuma county later in the evening before diffusing.

Thunderstorm Wind in PINAL, ARIZONA
From 17-AUG-20 20:10:00 to 17-AUG-20 20:10:00 (MST-7)
Location: LIRIM
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

A member of Maricopa Police Dispatch reported multiple power lines were blown down along Highway 238 between Hartman Road and Parker Road. A severe warned thunderstorm moved through this area with peak wind gusts around 55-60 mph. The thunderstorm winds also produced a dust storm with a report of visibility falling to 250 feet. Wind gusts and timing was estimated from radar.

Dust Storm in NORTHWEST PINAL COUNTY, ARIZONA
From 17-AUG-20 19:45:00 to 17-AUG-20 20:15:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter near the town of Maricopa reported visibility fell to roughly 250 feet within a dust storm. The dust storm was kicked up by outflow winds produced by storms in northern Pinal county. Winds with this dust storm were estimated around 30-35 mph based on radar. A separate much stronger outflow then pushed through the same area around 1951 MST, associated with severe warned storms in eastern Maricopa and northern Pinal counties, with winds estimated around 55-60 mph. A dust storm warning was in effect for this area from 1911 to 2015 MST. No injuries were reported.

Dust Storm in GILA RIVER VALLEY, ARIZONA
From 17-AUG-20 22:51:00 to 17-AUG-20 23:10:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter and other members of public reported visibility fell to around 100 feet near Dateland from a dust storm that was moving west through Yuma county. The dust storm resulted from a long lasting outflow that originated east of Phoenix and was reinforced by additional storms through the evening. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:42:00 to 17-AUG-20 19:42:00 (MST-7)
Location: WEST CHANDLER
Magnitude: 43.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained weather spotter reported two mesquite trees had 5-10 inch diameter limbs snap off. A small gazebo was also lifted from a backyard and displaced onto a fence. This occurred near Ray road and Kyrene road in west Chandler. A severe warned storm was moving through the area at the time. Winds were estimated around 50-55 mph from radar and nearby weather stations. No injuries were reported.

Dust Storm in SONORAN DESERT NATL MONUMENT, ARIZONA
From 17-AUG-20 20:30:00 to 17-AUG-20 20:45:00 (MST-7)
Crop damage: 0.00K
Reported by: Public

Visibility fell as low as a few hundred feet along Highway-238, east of Gila Bend, in a dust storm that was moving west through southern Maricopa county in the evening. The dust storm was produced by strong outflow winds from severe warned storms earlier in parts of eastern Maricopa and northern Pinal counties. Winds with the dust storm were estimated around 30-40 mph based on radar. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:55:00 to 17-AUG-20 19:55:00 (MST-7)
Location: HELENA
Magnitude: 43.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Public reported three 15-20 foot tall trees were uprooted near the 101 Freeway and Warner Road in south Tempe. Another twenty to thirty trees saw larger limbs snapped off as well. A severe warned storm was moving through the area with 50-55 mph winds. Winds were estimated from radar and nearby weather stations. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 17-AUG-20 19:04:00 to 17-AUG-20 19:04:00 (MST-7)
Location: APACHE JCT
Magnitude: 48.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds from a severe warned storm damaged 4 RV awnings and uprooted a 10-inch diameter tree. Winds were estimated around 50-60 mph from radar and area weather stations. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 22:16:00 to 17-AUG-20 22:16:00 (MST-7)
Location: SENTINEL
Magnitude: 48.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm winds, estimated around 55-60 mph based on radar and a RAWS station, flipped a semi-truck on I-8 near mile post 84 just west of Sentinel. Video from a storm chaser was posted online of the flipped semi around 10:15 PM MST and ADOT reported the eastbound lane of I-8 was closed about an hour later. Thunderstorm winds also produced a dust storm that pushed west along Interstate 8 with social media reports of visibility falling to around 100 feet just west of Dateland. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:40:00 to 17-AUG-20 19:40:00 (MST-7)
Location: (PHX)SKY HARBOR ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Phoenix Sky Harbor ASOS recorded a wind gust of 59 mph associated with a strong outflow from a severe warned thunderstorm moving through the southeast Phoenix metro area. Visibility at the airport also fell down to 2-3 miles from blowing dust.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:24:00 to 17-AUG-20 19:24:00 (MST-7)
Location: MESA
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A very large tree, at least 30-40 feet tall with a trunk over 1 foot in diameter, fell onto a house near Main street and Stapley drive in Mesa as a severe warned storm moved through the area. Radar estimated winds were around 55-65 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:25:00 to 17-AUG-20 19:25:00 (MST-7)
Location: HIGLEY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Multiple large trees were blown down in the Santan Village Marketplace near Market Street in Gilbert. Radar estimated winds were around 55-65 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 17-AUG-20 19:35:00 to 17-AUG-20 19:35:00 (MST-7)
Location: MC QUEEN
Magnitude: 48.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A pop-up 24-hour COVID-19 testing site in a parking lot at Mesa Comunity College was damaged when a severe warned thunderstorm moved through the area. Testing site tents and metal support frames were crumpled and tables were blown across the parking lot. No injuries were reported. Winds were estimated around 50-60 mph from radar.