The combination of near record moisture content (PWATs 1.8-2.0 inches), moderate to strong instability (SBCAPE  2000 J/KG), very slow steering flow and an upper-level disturbance resulted in a very conducive environment for the generation of thunderstorms producing very heavy rainfall activity across portions of south-central and southwestern Arizona, resulting in flash flooding. Activity first developed across the foothills and higher terrain of Eastern Maricopa and Gila Counties during the late morning-early afternoon hours. Another area of thunderstorms developed over northwestern Arizona during the mid-late afternoon hours and move southward towards La Paz County into the evening hours. One of the areas severely hit by flash flooding was Apache Junction, AZ. Weekes Wash, which runs through the town, went of out of its banks, causing widespread flooding impacts across the city. Flooding also took place from drainage that occurred off the Goldfield and Superstitions Mountains.

Flash Flood in MARICOPA, ARIZONA
From 28-JUL-22 12:30:00 to 28-JUL-22 15:30:00 (MST-7)
Location: TORTILLA FLAT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Arizona Department of Transportation reported SR 88 was closed due to flooding between milepost 201 and 205. No damages or injuries were reported.

Flash Flood in GILA, ARIZONA
From 28-JUL-22 12:15:00 to 28-JUL-22 14:15:00 (MST-7)
Location: MIAMI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A video posted on social media showed strong flow moving along the Bloody Tanks Wash, resulting a street crossing the wash near Mackey Camp to be completely impassable. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 28-JUL-22 13:00:00 to 28-JUL-22 15:00:00 (MST-7)
Location: SKYWAY VLG
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Water Users Recreation Site just downstream of Saguaro Lake was closed due to flash flooding and debris deposited into the Lower Salt River, making the water unsafe for public use. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 28-JUL-22 13:50:00 to 28-JUL-22 15:50:00 (MST-7)
Location: SUNFLOWER
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

North Lake Rd along Bartlett Lake was closed due to flooding and debris making the road impassable to vehicular traffic. No injuries were reported.

Flash Flood in GILA, ARIZONA
From 28-JUL-22 12:30:00 to 28-JUL-22 14:30:00 (MST-7)
Location: MIAMI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media video showed Bloody Tanks Wash in major elevated stage as it was flowing down the city of Miami. No damages or injuries were reported.

Flash Flood in PINAL, ARIZONA
From 28-JUL-22 12:00:00 to 28-JUL-22 17:00:00 (MST-7)
Location: APACHE JCT
Flood cause: Heavy Rain
Property damage: 1.00M
Crop damage: 0.00K
Reported by: County Official

Between 1 and 3 inches of rain fell within 1-2 hours across Apache Junction and the adjacent higher terrain north and east of the city, towards the Goldfield and Superstitions mountains. Water from those mountains drained down towards the area washes, including Weekes Wash, which runs through the city. Numerous roads were flooded and damaged along with multiple water rescues taking place of residents in homes that either were surrounded with water or had water inside them. One of the more dramatic water rescues occurred when a woman had to be rescued from her vehicle that was swept away by the flood waters of Weekes Wash and traveled half a mile downstream before encountering a box culvert. No injuries or fatalities were reported.

Flash Flood in LA PAZ, ARIZONA
From 28-JUL-22 21:00:00 to 28-JUL-22 23:00:00 (MST-7)
Location: QUARTZITE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

La Paz County Dispatch reported the following roadways were closed due to flooding from water overflowing from Tyson Wash:  Tyson Street, North Washington Avenue from Quail Trail to Kenoyer Streets, and Plymouth Road. at Mockingbird St. No damages or injuries were reported.