A second round of thunderstorms developed across the central deserts during the evening hours on August 11th, and some of them affected both the greater Phoenix metropolitan area as well as portions of northern Pinal county. Due to favorable atmospheric conditions, some of the stronger storms developed damaging microburst winds measured to be in excess of 60 mph at times. Among the areas hit the hardest was the southeast portion of the greater Phoenix area including the community of Chandler. The strong winds blew down a number of trees and power lines, and damaged a large number of airplanes stored at the Chandler Municipal Airport.

Thunderstorm Wind in PINAL, ARIZONA
From 11-AUG-15 20:45:00 to 11-AUG-15 20:55:00 (MST-7)
Location: CASA GRANDE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms affected the central deserts of Arizona, including the community of Casa Grande, during the evening hours on August 11th and one of the stronger ones produced outflow winds in excess of 60 mph. At 2045MST a mesonet weather station 3 miles to the northwest of Casa Grande measured a peak wind gust of 65 mph. Shortly thereafter, at 2055MST the official Casa Grande airport AWOS weather station measured a wind gust of 59 mph.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-AUG-15 21:38:00 to 11-AUG-15 21:38:00 (MST-7)
Location: CHANDLER HGTS
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms affected the southeastern portion of the greater Phoenix metropolitan area during the evening hours on August 11th, and the stronger ones produced gusty and damaging microburst winds estimated to be in excess of 60 mph. According to a trained weather spotter located 1 mile northwest of Seville, or near Chandler Heights, at about 2138MST gusty winds estimated to be near 65 mph downed a large tree near Chandler Heights and Higley Road. The tree had a diameter of one foot.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-AUG-15 21:00:00 to 11-AUG-15 21:15:00 (MST-7)
Location: CHANDLER ARPT
Magnitude: 65.00 EG
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms developed across the southeastern portion of the greater Phoenix metropolitan area during the evening hours on August 11th, and some of the stronger ones produced damaging microburst winds estimated to be in excess of 70 mph. One community that was hit especially hard by the damaging winds was Chandler. According to local broadcast media, damaging microburst winds estimated as high as 75 mph struck the Chandler Municipal airport at about 2100MST. 41 out of 400 small aircraft stored at the airport sustained significant damage. Additionally, an air stairs was blown over. At 2120MST the Chandler Airport AWOS weather station measured wind gusts at 62 mph. Fortunately there were no injuries reported due to the strong microburst.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-AUG-15 20:50:00 to 11-AUG-15 20:55:00 (MST-7)
Location: GERMANN
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms brought gusty and damaging microburst winds to the southeast part of the greater Phoenix area during the evening hours on August 11th, and they especially affected the community of Chandler. According to a trained weather spotter located about 2 miles southwest of the Phoenix Mesa-Gateway airport, microburst winds estimated to be at least 70 mph in strength downed seven large trees in a neighborhood near Power Road and Germann Road. The trunk diameters ranged from six inches to two feet. In addition, a railroad crossing arm was damaged by the strong winds at the intersection of Power and Pecos.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-AUG-15 21:19:00 to 11-AUG-15 21:19:00 (MST-7)
Location: (CHD)WILLIAMS AFB
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorms affected the southeast portion of the greater Phoenix area during the evening hours on August 11th and some of the stronger storms produced wind gusts in excess of 60 mph. At 2120MST, the official AWOS weather station at Phoenix Mesa Gateway airport measured a wind gust of 62 mph.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-AUG-15 21:06:00 to 11-AUG-15 21:06:00 (MST-7)
Location: BOYS RANCH
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms affected the far southeastern portions of the greater Phoenix area during the evening hours on August 11th, and the stronger ones produced gusty and damaging microburst winds estimated to be in excess of 60 mph. One community that was especially affected was Queen Creek. According to a trained weather spotter located about 2 miles east of Queen Creek, gusty microburst winds estimated to be at least 65 mph uprooted a palm tree near Rittenhouse Road and Ocotillo Road. No injuries were reported due to the strong winds.

Thunderstorm Wind in PINAL, ARIZONA
From 11-AUG-15 20:50:00 to 11-AUG-15 20:50:00 (MST-7)
Location: MAGMA
Magnitude: 60.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Utility Company

Scattered thunderstorms developed over the southeast portion of the greater Phoenix area during the evening hours on August 11th, and they brought gusty outflow winds estimated to be in excess of 60 mph at times. The strong winds downed power lines and this led to widespread power outages. According to the Salt River Project utility company, at 2050MST approximately 11,400 SRP customers were without power across the southeastern greater Phoenix area and the area that was affected the most was the San Tan Valley.

Thunderstorm Wind in PINAL, ARIZONA
From 11-AUG-15 21:23:00 to 11-AUG-15 21:23:00 (MST-7)
Location: FLORENCE JCT
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Department of Highways

Evening thunderstorms affected portions of the central deserts, including the community of Florence Junction, on August 11th. Some of the stronger storms generated gusty and damaging outflow winds estimated to be at least 60 mph in strength. According to the Department of Highways, strong winds downed power lines in the town of Florence Junction at about 2123MST. The downed power lines resulted in the closure of U.S. 60 at Milepost 210.