Scattered monsoon thunderstorms developed across the greater Phoenix metropolitan area during the evening hours on September 2nd. The storms brought many of the typical weather hazards to the area: strong gusty and damaging outflow winds, locally heavy rain and urban flooding, and dense blowing dust. Dust storm conditions were observed east of Phoenix; the visibility dropped to one quarter of a mile in dense blowing dust at Phoenix Mesa-Gateway airport at 1805MST. At 1729MST trained spotters in the Tolleson area west of Phoenix measured 1.2 inches of rain and that resulted in curb to curb street flooding. Wind damage occurred in north Phoenix; the public reported that a tree was blown down onto a fence at 12th Avenue and Cave Creek Road. Finally, at about 1800MST there were multiple reports from trained spotters and the public regarding storm damage including multiple trees down in the community of Queen Creek. No injuries were reported due to the wind damage.

Dust Storm in SOUTHEAST VALLEY/QUEEN CREEK, ARIZONA
From 02-SEP-18 17:25:00 to 02-SEP-18 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorms with strong and gusty outflow winds affected the east and southeast portion of the greater Phoenix metropolitan area during the late afternoon and early evening hours on September 2nd. The stronger storms generated gusty outflow winds in excess of 40 mph that created dense blowing dust and dust storm conditions. At 1805MST the official AWOS weather station at the Phoenix Mesa-Gateway airport measured a visibility of one quarter mile in blowing dust. Winds were measured at 40 mph at the time. A Dust Storm Warning was issued for the area at 1725MST and it remained in effect until 1900MST. No accidents were reported due to the sharply reduced visibility and subsequent hazardous driving conditions.

Thunderstorm Wind in MARICOPA, ARIZONA
From 02-SEP-18 18:45:00 to 02-SEP-18 18:45:00 (MST-7)
Location: CACTUS
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms with gusty and damaging outflow winds moved across the northern portions of the greater Phoenix area during the evening hours on September 2nd. One of the stronger storms affected portions of north Phoenix and Deer Valley. According to a report from the public, gusty outflow winds estimated to be near 65 mph in strength blew down a tree about 7 miles southeast of Deer Valley. The tree was blown down and onto a fence at 12th Street and Cave Creek Road. No injuries were reported due to the fallen tree.

Heavy Rain in MARICOPA, ARIZONA
From 02-SEP-18 17:20:00 to 02-SEP-18 20:30:00 (MST-7)
Location: TOLLESON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with locally heavy rain developed across the western portion of the greater Phoenix metropolitan area during the evening hours on September 2nd. Some the stronger storms produced rain rates in excess of 3 inches per hour which led to flooding issues in communities such as Tolleson and Avondale. At 1729MST a trained weather spotter located about 3 miles northwest of the town of Tolleson reported 1.20 inches of rain that fell in a 20 minute period. The heavy rain occurred at 107th Avenue and Thomas road and resulted in curb to curb street flooding. Despite the intense rainfall, flash flooding was not observed. Shortly after the report, an Urban and Small Stream Flood Advisory was issued for the area; it was issued at 1735MST and remained in effect until 2030MST.

Thunderstorm Wind in MARICOPA, ARIZONA
From 02-SEP-18 18:00:00 to 02-SEP-18 18:05:00 (MST-7)
Location: BOYS RANCH
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with strong, damaging outflow winds moved across the southeast portion of the greater Phoenix area during the early evening hours on September 2nd. One of the stronger storms affected the community of Queen Creek. According to a trained weather spotter located 2 miles east of Queen Creek, at 1800MST gusty winds estimated to be at least 65 mph bent down an outdoor canopy tent pole at 233rd Place and East Via Del Palo Road. At the same time, the general public reported multiple instances of storm damage and trees downed in the Villages subdivision in Queen Creek. Wind gusts were estimated to be even higher, at about 70 mph. A few minutes later, at 1804MST, another trained spotter reported several trees blown down at 23425 South 223rd Place. As with the previous damage reports, the trees were downed about 2 miles east of Queen Creek. No injuries were reported due to the storm damage and downed trees.