Thunderstorms developed across portions of south central Arizona during the afternoon on August 27th, and many of them affected the greater Phoenix metropolitan area. Due to a combination of elevated moisture and instability and moderately strong winds aloft, the stronger storms were able to produce strong, damaging microburst winds, in addition to locally heavy rain and small hail. The storms produced a wide variety of damage and impacted a number of communities, including Peoria, Glendale, Surprise, central Phoenix and Tempe. Numerous trees and power poles were blown down, metal carports were ripped apart and significant damage occurred to a mobile home park near Phoenix Metro Center. Heavy rain, with rain rates approaching 2 inches per hour, led to urban flooding in Superior.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 15:45:00 to 27-AUG-15 15:45:00 (MST-7)
Location: ENNIS
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms moved across the northwest portion of the greater Phoenix metropolitan area during the afternoon hours on August 27th and some of the stronger storms generated strong gusty and damaging outflow winds. One of the communities that was affected by the strong winds was the town of Peoria. According to local emergency managers, at 1545MST gusty winds estimated to be as high as 70 mph blew down 20 trees near the intersection of West Beardsley Road and North 99th Avenue in Peoria.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 14:45:00 to 27-AUG-15 14:45:00 (MST-7)
Location: GILA CROSSING
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorms affected much of the greater Phoenix metropolitan area during the afternoon hours on August 27th, including southern communities such as Ahwatukee. Some of the stronger storms generated gusty and damaging outflow winds, estimated to be in excess of 60 mph. According to a National Weather Service employee, at 1445MST strong winds ripped up a tree with a diameter of 2 feet. The damaged tree was located about 3 miles south of South Mountain Park, along Pecos Road. In addition, numerous branches were torn off of trees in the area.

Heavy Rain in MARICOPA, ARIZONA
From 27-AUG-15 17:00:00 to 27-AUG-15 19:00:00 (MST-7)
Location: KENDALL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Strong thunderstorms continued across much of the greater Phoenix area during the late afternoon hours on August 27th. Some of the storms produced locally heavy rainfall, affecting central Phoenix communities such as Mesa and Tempe. Peak rainfall rates were measured to be around 2 inches per hour. According to an amateur radio report, one inch of rain was measured within 30 minutes about one mile northwest of Arizona State University in north Tempe. The heavy rain led to the issuance of an Urban and Small Stream Flood Advisory at 1701MST. However, no reports of significant flooding were received.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 14:30:00 to 27-AUG-15 14:30:00 (MST-7)
Location: TORTILLA FLAT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms developed across southern Gila County during the afternoon hours on August 27th, and the stronger ones produced strong and gusty outflow winds. At 1430MST a mesonet weather station at the Roosevelt Dam measured a wind gust to 58 mph.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 15:20:00 to 27-AUG-15 15:23:00 (MST-7)
Location: BEARDSLEY
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms developed over the greater Phoenix metropolitan area during the afternoon hours on August 27th, and due to a combination of elevated instability and wind fields aloft, some of the storms produced strong, gusty and damaging microburst winds. One community that was impacted by the damaging winds was Peoria. According to a report from the public, microburst wind damage was observed about 4  miles northwest of Peoria. Wind gusts estimated to be at least 70 mph tossed a barbeque grill 20 feet; the grill weighed 150 pounds. Additionally, the winds blew down a 30 foot tall tree; the tree had a diameter of 18 inches. The tree fell upon the roof a nearby house. Fortunately there were no injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 16:09:00 to 27-AUG-15 16:09:00 (MST-7)
Location: (LUF)LUKE AFB
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorms moved across the western portion of the greater Phoenix metropolitan area during the afternoon hours on August 27th, and some of them produced strong and gusty outflow winds. At 1609MST, the official ASOS weather sensor at Luke Air Force Base measured a wind gust to 61 mph.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 16:55:00 to 27-AUG-15 17:00:00 (MST-7)
Location: KENDALL
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms moved across the central portion of the greater Phoenix metropolitan area during the late afternoon hours on August 27th; due to elevated instability and upper level wind fields, the stronger storms generated gusty and damaging microburst winds. According to local broadcast media reports, at 1700MST, microburst winds estimated to be around 70 mph ripped off a number of metal car ports in the parking lot at the Papago Park Riverwalk Condominiums. The condo was about 1 mile southwest of Papago Park, in the vicinity of far north Tempe. The media also reported that very large trees were uprooted and blown down in the same area, about 2 miles southwest of Papago Park. A Severe Thunderstorm Warning was in effect at the time of the wind damage.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 16:35:00 to 27-AUG-15 17:05:00 (MST-7)
Location: PETERSON
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms moved across the central portion of the greater Phoenix metropolitan area during the afternoon hours on August 27th; due to a favorable combination of elevated instability and wind fields aloft, the stronger storms produced strong, gusty and damaging microburst winds. One community especially impacted by the damaging winds was Tempe. At 1635MST, local broadcast media reported that a large tree was uprooted 1 mile to the southeast of Arizona Mills Mall in Tempe. Wind gusts were estimated to be as high as 65 mph. Minor structural damage was also reported. About 30 minutes later, the media reported that more trees were blown down 1 mile southeast of Tempe.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 16:00:00 to 27-AUG-15 16:30:00 (MST-7)
Location: GLENDALE FRAM ARPT
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms moved across the western portion of the greater Phoenix metropolitan area during the afternoon hours on August 27th; some of the stronger storms produced gusty and damaging outflow winds estimated to be as high as 70 mph. At 1600MST, local emergency managers reported that power poles were downed on Glendale Avenue from Glen Harbor Boulevard to El Mirage. This location was about 2 miles west of the Glendale Sports Complex. About 30 minutes later, trained weather spotters 4 miles west of Luke Air Force Base reported power poles and power lines downed by the strong thunderstorm outflow winds. No injuries were reported due to the strong winds.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-15 16:00:00 to 27-AUG-15 16:00:00 (MST-7)
Location: SUNNYSLOPE
Magnitude: 70.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms raked the north central portion of the greater Phoenix metropolitan area during the afternoon hours on August 27th; due to a favorable combination of enhanced instability and wind fields aloft, the stronger storms were able to generate strong damaging microburst winds. Some of the areas that were especially hard hit were northern communities such as north Phoenix and North Mountain Park. According to local broadcast media reports, at 1600MST gusty winds estimated to be as high as 80 mph produced significant structural damage to a mobile home park located about 1 mile southeast of the Metro Center Mall. The damage was just east of Interstate 17 and north of West Dunlap Avenue. No injuries were reported.