Thunderstorms developed across the higher terrain of eastern Arizona during the afternoon hours on July 9th, and they gradually spread westward and into the lower elevations of south-central Arizona during the evening hours. Some of the stronger thunderstorms generated intense rainfall with peak rain rates approaching 2 inches per hour. During the course of the evening, the heavy rain resulted in several episodes of both street flooding as well as flash flooding across the central deserts; some of the flooding impacted the greater Phoenix area as well as higher terrain areas on the fringes of the metropolitan area. Much of the flash flooding involved washes that were running heavily or even outside of their banks; for instance at about 2100MST Skunk Creek was flowing with water 5 feet deep, but not yet overflowing its banks. Weeks Wash in Apache Junction was also flooded, with water and debris spilling onto area roads. No reports of injuries were received as a result of the flash flooding.

Flash Flood in MARICOPA, ARIZONA
From 30-JUL-18 20:30:00 to 30-JUL-18 22:30:00 (MST-7)
Location: PHOENIX DEER VLY ARP
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with very heavy rain developed over the far northeast portions of the greater Phoenix area during the early evening hours on July 30th; peak rain rates with the stronger storms approached 2 inches per hour. The heavy rain caused washes, such as Skunk Creek Wash, to flow very heavily and flash flooding was observed. According to a member of the public located 7 miles southeast of New River, in an area northeast of the intersection of the Carefree Highway and Interstate 17, the Skunk Creek Wash was flowing 5 feet deep at 2104MST. Shortly thereafter in nearly the same location, at 2112MST a trained spotter reported the wash was flooding at the intersection of Maddock Road and 15th Avenue; water was flowing 3 feet deep across the road at that location. A Flash Flood Warning had been issued at 1924MST for the area and this warning was updated at 2121MST to indicate flash flooding along Skunk Creek Wash near the intersection of Desert Hills Drive and 15th Avenue. No reports of injuries were reported due to the flash flooding.

Flash Flood in PINAL, ARIZONA
From 30-JUL-18 17:30:00 to 30-JUL-18 19:00:00 (MST-7)
Location: FLORENCE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms developed over the higher terrain of eastern Arizona during the afternoon hours on July 30th and the stronger storms generated intense rainfall with peak rain rates approaching 2 inches per hour. The heavy rain resulted in a few episodes of evening flash flooding and one of them affected the town of Florence. At 1800MST, the Pinal County Office of Emergency Management reported flash flooding along Main Street which resulted in water that flowed into their offices. No injuries were reported. A Flash Flood Warning was not in effect at the time of the flooding.

Flash Flood in MARICOPA, ARIZONA
From 30-JUL-18 21:00:00 to 30-JUL-18 23:00:00 (MST-7)
Location: MORRISTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with very heavy rain developed just south of Wickenburg during the evening hours on July 30th; radar indicated rainfall amounts of up to 2 inches had fallen which resulted in flooding of area streams and washes such as the Box Wash. Significant rises in the streams and washes impacted various low water crossings and resulted in flash flooding. According to mesonet data, there were quick water rises noted in the Box Wash which impacted low water crossings at Restin Road, Galvin Road and Whispering Ranch Road. The Maricopa County stream gauge along Box Wash quickly increased with a rise of greater than 3 feet. Based on the mesonet gauge data flash flooding was occurring by 2135MST. The general location of the stream gauge as well as the significant flash flooding was 9 miles southwest of Morristown.

Heavy Rain in MARICOPA, ARIZONA
From 30-JUL-18 20:00:00 to 30-JUL-18 21:00:00 (MST-7)
Location: PHOENIX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with locally heavy rain developed in the greater Phoenix area during the evening hours on July 30th; some of the stronger storms generated intense rain with  peak rain rates in excess of one inch per hour. The heavy rain resulted in some street flooding in downtown Phoenix. According to a trained weather spotter, at 2018MST heavy rain resulted in minor street flooding at the intersection of 19th Avenue and Adams Road. The street flooding led to traffic flow issues however no accidents were reported.

Flash Flood in PINAL, ARIZONA
From 30-JUL-18 19:45:00 to 30-JUL-18 22:30:00 (MST-7)
Location: PALM SPGS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorms developed over the higher terrain of eastern Arizona during the early evening hours and some of them moved to the west and into the eastern portion of the greater Phoenix area during the evening hours. The stronger storms produced intense rainfall with peak rain rates approaching 2 inches per hours; the heavy rain lead to an episode of flash flooding in the Apache Junction area. According to information from the Arizona Department of Highways, at 2010MST water was flowing across several low water crossings in Apache Junction, including Weekes Wash. The flash flooding resulted in debris and sedimentation left behind on some of the roads. The information supplied by the public works department. A Flash Flood Warning was issued for the area at 1940MST and it remained in effect until 2245MST.