Scattered monsoon thunderstorms developed across the greater Phoenix area at various times of the day, including the early afternoon and late evening hours, on August 12th. Some of the stronger storms impacted various west Phoenix communities such as Goodyear and Avondale and Buckeye. The storms produced typical monsoon weather hazards such as gusty damaging outflow winds as well as locally heavy rainfall. Flash flooding was observed during the late evening just to the west of Goodyear, near the intersection of Interstate 10 and the loop 303 freeway. The loop 303 southbound exit was flooded at Thomas Road and other roads were impassible near Sarival and McDowell Roads. Shortly after noon, several roads were reported closed due to washes flowing over them approximately 6 to 8 miles southeast of the town of Buckeye.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-17 22:00:00 to 13-AUG-17 01:15:00 (MST-7)
Location: PERRYVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Scattered thunderstorms developed during the late evening hours across the western portion of the greater Phoenix metropolitan area and some of the stronger storms affected the west valley near the community of Goodyear. The storms generated locally heavy rain with peak rain rates in excess of one inch per hour, more than sufficient to cause localized flash flooding given the urban nature of the surface, with impermeable ground covered in concrete and asphalt. At 2233MST, a public report was received indicating flash flooding near the intersection of Interstate 10 and Sarival Road; the flooding caused roads in the area to become impassable. The flash flooding was only a mile or two northwest of the Phoenix Goodyear Airport. A few minutes later at 2240MST, another public report was received indicating that flash flooding had caused 8 to 10 inches of water to be standing on the roads about 2 miles northwest of Goodyear. The flooding was just north of McDowell Road and east of the Loop 303 freeway, near the intersection of West Almeria Road and North 160th Avenue. A Flash Flood Warning was in effect at the time of the flooding; it was issued at 2212MST and ran through 0115MST the next morning.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-AUG-17 04:15:00 to 12-AUG-17 04:15:00 (MST-7)
Location: LITCHFIELD PARK
Magnitude: 43.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Isolated thunderstorms developed across portions of the greater Phoenix area during the early morning hours on August 12th and some of them affected the area around Litchfield Park in west Phoenix. According to a broadcast media report, at 0415MST gusty winds estimated to be up to 50 mph in strength blew down several trees near the intersection of Thomas and Dysart Roads, about 2 miles to the southeast of Litchfield Park.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-AUG-17 22:30:00 to 12-AUG-17 22:30:00 (MST-7)
Location: GLENDALE
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms moved across the western portion of the greater Phoenix area during the late evening hours on August 12th, and some of the storms affected the community of Glendale. One of the stronger storms generated gusty damaging microburst winds estimated to be upwards of 65 mph. According to a report from local broadcast media, at 2230MST microburst winds downed 2 large trees about 2 miles west of Glendale, near the intersection of West Glendale Avenue and North 71st Avenue. One of the large trees fell and landed on a house. Fortunately no injuries were reported due to the falling trees.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-17 12:00:00 to 12-AUG-17 14:45:00 (MST-7)
Location: LIBERTY
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorms developed across the central and southwest portions of the greater Phoenix area during the morning hours on August 12th, and some of them produced locally heavy rains which impacted areas to the southeast of Buckeye. Intense rain rates in excess of one inch per hour led to episodes of flash flooding during the late morning and early afternoon hours. At 1221MST the Maricopa County Department of Transportation reported that Tuthill Road was closed between Fairview and Ray Roads due to a wash flowing over the road. This was about 8 miles southeast of the town of Buckeye, and west of the Estrella Mountain Regional Park. Shortly after that, at 1242MST, the Department of Transportation reported flash flooding about 6 miles southeast of Buckeye. They reported that Narramore Road was closed between 214th and 218th Avenue due to a wash that was flowing over a road. No injuries were reported due to the flash flooding. A Flash Flood Warning had been issued hours before the flooding, at 0845MST and the warning remained in effect through 1445MST.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-17 22:00:00 to 13-AUG-17 01:15:00 (MST-7)
Location: MC MICKEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Scattered thunderstorms developed across the western portion of the greater Phoenix metropolitan area, including the community of Goodyear, during the evening hours on August 12th. Some of the stronger storms produced intense rainfall with rainfall rates in excess of one inch per hour. The rain was sufficient to cause episodes of flash flooding given the urban nature of the environment dominated by paved roads and other surfaces. At 2252MST, Arizona Department of Transportation reported flash flooding along the loop 303 freeway; the southbound exit at Thomas Road was flooded. A Flash Flood Warning was in effect at the time of the flooding; it was issued at 2212MST and was in effect through 0115MST the next morning.