The weather pattern across the desert southwest was conducive to another round of strong afternoon and evening thunderstorms across south central Arizona on August 29th. Elevated southwesterly wind fields aloft, ample moisture and instability combined to produce scattered thunderstorms, many of which affected the greater Phoenix metropolitan area. The stronger storms produced damaging microburst winds in excess of 60 mph which uprooted trees, downed power lines, and damaged roofs. The storms also produced locally heavy rain with rain rates in excess of 2 inches per hour; the rain led to urban flooding in portions of the greater Phoenix area.

Heavy Rain in MARICOPA, ARIZONA
From 29-AUG-15 18:30:00 to 29-AUG-15 22:00:00 (MST-7)
Location: HIGLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the southeastern portion of the greater Phoenix metropolitan area during the evening hours on August 29th, and some of the stronger ones produced locally heavy rainfall with peak rain rates in excess of 1.5 inches per hour. At 1840MST a trained weather spotter living near Chandler Heights measured 1.4 inches of rain within the past 37 minutes. The rain fell near the intersection of South Higley and East Ocotillo Roads. The heavy rain in the area led to the issuance of an Urban and Small Stream Flood Advisory at 1917MST and also caused urban flooding.

Thunderstorm Wind in MARICOPA, ARIZONA
From 29-AUG-15 20:17:00 to 29-AUG-15 20:17:00 (MST-7)
Location: MESA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Scattered thunderstorms affected the southeastern portion of the greater Phoenix metropolitan area during the evening hours on August 29th, and some of the stronger storms generated very gusty winds in excess of 50 mph. At 2017MST, a National Weather Service employee living in east Mesa estimated peak wind gusts between 50 and 60 knots at the intersection of Lindsay and Gilbert roads. The thunderstorms also produced local street flooding and pea sized hail was observed. No damage was reported due to the strong winds.

Thunderstorm Wind in PINAL, ARIZONA
From 29-AUG-15 18:00:00 to 29-AUG-15 18:00:00 (MST-7)
Location: FLORENCE
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorms developed to the southeast of the greater Phoenix metropolitan area during the late afternoon hours on August 29th, affecting locations in the vicinity of Florence. Due to a combination of elevated moisture, instability and winds aloft, the stronger storms generated damaging microburst winds estimated to be in excess of 70 mph. According to a report from the public, at 1800MST a microburst hit to the northwest of Florence, about 5 miles north of the community of Valley Farms. The strong winds blew off roof boards and tiles from numerous homes and snapped and uprooted dozens of trees in the area. Board debris from the damage could also be found in some yards in the town of Florence.

Thunderstorm Wind in MARICOPA, ARIZONA
From 29-AUG-15 20:00:00 to 29-AUG-15 20:00:00 (MST-7)
Location: BUCKHORN
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across the greater Phoenix metropolitan area during the evening hours on August 29th, and some of the stronger storms generated gusty and damaging outflow winds which affected the city of Mesa. According to a trained weather spotter, at 2000MST winds gusts estimated to be at least 60 mph blew down 5 to 6 power lines at the intersection of Broadway Road and South Lindsay Road in east Mesa. The gusty winds also ripped off some roofing tiles and blew them into the road. Small hail, one half inch in diameter, also occurred with the storms.

Heavy Rain in MARICOPA, ARIZONA
From 29-AUG-15 20:00:00 to 29-AUG-15 22:15:00 (MST-7)
Location: MC QUEEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Scattered thunderstorms developed across portions of the greater Phoenix metropolitan area during the evening hours on August 29th. Some of the stronger storms produced locally heavy rainfall with peak rain rates well in excess of one inch per hour. Some of the heavy rain affected the community of Mesa. The rain led to episodes of urban street flooding which necessitated the issuance of an Urban and Small Stream Flood Advisory during the late evening hours. At 2017MST a National Weather Service employee reported street flooding on Broadway road between Lindsay and Gilbert roads in Mesa. Later, at 2119MST, a public report was received of major ponding of water at the intersection of Southern and Dobson, about 1 mile to the northwest of Fiesta Mall in Mesa. No reports of significant accidents were received due to the heavy rainfall.

Thunderstorm Wind in MARICOPA, ARIZONA
From 29-AUG-15 18:45:00 to 29-AUG-15 19:49:00 (MST-7)
Location: HIGLEY
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across portions of the greater Phoenix metropolitan area during the evening hours on August 29th, and the stronger ones produced gusty and damaging winds which affected communities such as Chandler and Ahwatukee. According to a trained weather spotter, at 1949MST gusty winds estimated to at least 65 mph uprooted and snapped 2 trees at the San Tan Village mall. About one hour earlier, strong winds uprooted a 21 inch diameter tree 2 miles east of the town of Ahwatukee, according to a report from the public.