Thunderstorms with very heavy rain developed across portions of the south-central deserts during the evening hours on August 12th. Rainfall with the stronger storms was very intense; a flood control district rain gauge north of Sun City West measured almost 1.9 inches of rain and exhibited peak rain rates in excess of 3 inches per hour. The heavy rain resulted in several water rescues across the far northwest portions of Phoenix. As an example, at 2039MST broadcast media reported the water rescue of a car stuck in a wash at the intersection of 147th Avenue and Pinnacle Vista Road. A Flash Flood Warning was issued for the area. Additionally, flash flooding occurred to the west of Phoenix; at 2010MST there was a report of water across Agua Caliente Road near the Fourth of July Wash, in the higher terrain areas to the northwest of Gila Bend. Fortunately, no injuries were reported with any of flash flood episodes.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-18 19:30:00 to 12-AUG-18 22:00:00 (MST-7)
Location: SUNDAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms with locally heavy rainfall moved across the deserts to the west of Phoenix during the evening hours on August 12th. Some of the stronger storms produced locally heavy rains with peak rain rates in excess of one inch per hour; the heavy rain led to an episode of flash flooding northwest of Gila Bend and south of Interstate 10. According to a report from the general public, at 2010MST water was flowing over the Agua Caliente Road along the Fourth of July Wash. A Maricopa County Flood Control District rain gauge upstream of the road exceeded its alarm stage which is indicative of flash flooding downstream and along the wash. A Flash Flood Warning was not issued, instead a Flood Advisory was in effect at the time of the flooding and the advisory remained in effect through 2200MST.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-18 19:35:00 to 12-AUG-18 22:30:00 (MST-7)
Location: BEARDSLEY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms with very heavy rain moved across the far northwest portions of the greater Phoenix area during the evening hours on August 12th; some of the stronger storms produced heavy rain with peak rain rates in excess of 3 inches per hour. The heavy rain led to an episode of flash flooding north of Sun City West and southeast of Wittmann. According to a report from local broadcast media, at 2038MST flash flooding 4 miles northeast of Beardsley resulted in the water rescue of a car stuck in a wash at the intersection of 147th Avenue and Pinnacle Vista Road. The car had multiple occupants; fortunately there were no reports of injuries to any of them. A Flash Flood Warning was in effect at the time of the water rescue and it remained in effect through 2230MST.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-18 19:35:00 to 12-AUG-18 22:30:00 (MST-7)
Location: WITTMANN
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorms with very heavy rain moved across the far northwest portions of the greater Phoenix metropolitan area during the evening hours on August 12th. Some of the stronger storms affected areas to the north of Sun City West. Peak rainfall rates exceeded 3 inches per hour at times; at 1948MST a flood control district gauge measured 1.89 inches of rain at 163rd Avenue and Cap Canal Service Road within a 50 minute period. 1.14 inches of that total fell within 20 minutes. The intense rainfall led to an episode of flash flooding about 6 miles northwest of Beardsley. At 2025MST, local fire and rescue reported a water rescue of multiple occupants of a truck at 163rd Avenue and White Wing Road. Multiple low water crossings were flooded along 163rd Avenue north of Grande Avenue.
There were no reports of injuries to any of the truck occupants. A Flash Flood Warning was in effect at the time of the rescue and it remained in effect through 2230MST.