A well organized monsoonal circulation was in place across Arizona on the 18th, and plentiful moisture streamed northward across the central deserts. The combination of ample moisture and modest instability allowed isolated thunderstorms to develop in the greater Phoenix area during the late afternoon hours. Some of the stronger thunderstorms generated gusty and damaging winds, measured to be in excess of 60 mph. The strong wind gusts pulled the roof off of an apartment complex in central Phoenix; fortunately there were no injuries. Heavy rains also led to an isolated instance of flash flooding in central Phoenix which led to minor property damage to a gas station.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-JUL-16 18:09:00 to 18-JUL-16 18:09:00 (MST-7)
Location: (PHX)SKY HARBOR ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Isolated thunderstorms developed during the late afternoon hours across the greater Phoenix metropolitan area and one of the stronger storms moved to the north and across Phoenix Sky Harbor airport. According to the official ASOS weather station at the airport, a wind gust of 63 mph was measured at 1809MST.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-JUL-16 18:08:00 to 18-JUL-16 18:14:00 (MST-7)
Location: PETERSON
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorms developed across the greater Phoenix area during the late afternoon and early evening hours, and some of them moved across the community of Guadalupe. The stronger storms generated gusty and damaging outflow winds estimated to be 60 mph or greater. According to an NWS employee, several medium sized trees were blown down around the town of Guadalupe, others had branches broken off and one medium sized tree was uprooted and blown onto a road.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-JUL-16 18:00:00 to 18-JUL-16 18:10:00 (MST-7)
Location: (PHX)SKY HARBOR ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Isolated strong thunderstorms developed across the greater Phoenix metropolitan area during the late afternoon and early evening hours on July 18th. Some of the stronger storms affected central Phoenix and the area around Sky Harbor International Airport, bringing gusty and damaging winds estimated to be in excess of 60 mph. According to an article on the ABC15.com website, gusty winds blew down a cinder block wall at a home near 30th Street and Baseline Road. In the same neighborhood, the same strong winds blew down a second cinder block wall and also blew a street sign down the block. The warped sign ended up a block from its pole. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 18-JUL-16 18:00:00 to 18-JUL-16 20:00:00 (MST-7)
Location: LAVEEN
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Isolated strong thunderstorms developed across the central portion of the greater Phoenix metropolitan area during the late afternoon and early evening hours on July 18th. The storms produced very heavy rain and radar estimated that over one inch fell quickly around south Phoenix, leading to flash flooding. According to local broadcast media, at 1825MST,  heavy rain near 24th Street and Baseline Road led to significant street flooding as well as minor property damage to a local gas station. Another family in south Phoenix reported that water flowing down south Mountain knocked down the back wall to their property and rushed into and around their home leading to significant water damage at the home.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-JUL-16 18:20:00 to 18-JUL-16 18:25:00 (MST-7)
Location: (PHX)SKY HARBOR ARPT
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: County Official

Isolated thunderstorms developed and moved north across the greater Phoenix metropolitan area during the late afternoon and early evening hours on July 18th. One of the stronger storms moved across Phoenix Sky Harbor airport and generated gusty and damaging winds. According to a county official with the city of Phoenix, at 1825MST damaging thunderstorm outflow winds pulled the roof off of an apartment complex located at the intersection of 26th Street and Van Buren Street. The apartment complex was about 1 mile northwest of the airport. Peak wind gusts were estimated to be about 70 knots. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-JUL-16 19:40:00 to 18-JUL-16 19:42:00 (MST-7)
Location: KENDALL
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the central portion of the greater Phoenix area during the early evening hours on July 18th, and due to a favorable combination of moisture and instability, isolated strong storms generated gusty and damaging outflow winds. According to a trained weather spotter, at about 1942MST, gusty outflow winds estimated to be as high as 70 mph blew down multiple palm trees 3 miles to the northeast of Phoenix Sky Harbor International Airport. Additionally, about 20 minutes earlier, another spotter 3 miles southwest of Phoenix Sky Harbor Airport reported that a large tree was blown down due to gusty winds estimated at 60 mph.