Thunderstorms developed across the central deserts during the afternoon hours on July 11th, and the stronger storms produced intense rainfall that led to episodes of flash flooding to the south of Phoenix, mainly across the northwest portions of Pinal County. The storms also produced gusty outflow winds that stirred up significant amounts of dust which led to dust storm conditions near the town of Coolidge. Some of flash flooding impacted both highway 238 and Interstate 8 just east of the Maricopa County Line. Flooding was also observed in area washes such as the Vekol Wash to the west of the Ak Chin indian reservation. Fortunately there were no reported of accidents or injuries due to the flash flooding or dense blowing dust.

Dust Storm in NORTHWEST PINAL COUNTY, ARIZONA
From 11-JUL-18 14:00:00 to 11-JUL-18 14:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms developed across the deserts southeast of Phoenix during the afternoon hours on July 11th, and some of the stronger storms produced strong gusty outflow winds that created dust storm conditions in Coolidge. At 1400MST a report from the public was received indicating that visibility had fallen below one quarter of a mile in a dust storm. The dust storm report was from north Coolidge, near the intersection of Arizona Boulevard and Highway 287. The report came from Twitter.

Flash Flood in PINAL, ARIZONA
From 11-JUL-18 16:00:00 to 11-JUL-18 19:00:00 (MST-7)
Location: STANFIELD
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms with locally heavy rain developed over the central deserts during the afternoon hours on July 11th and they affected areas south of Phoenix and between Gila Bend and Casa Grande. The heavy rain led to flash flooding along Interstate 8 just east of the Maricopa County line. According to a report from the public, at 1619MST a wash crossing a roadway was flowing rapidly; flash flooding was occurring as water levels in the wash were rising quickly. The location of the flash flooding was near the intersection of Interstate 8 and Arizona State Route 84. A Flash Flood Warning was issued for the area at 1603MST and it remained in effect until 1900MST.

Flash Flood in PINAL, ARIZONA
From 11-JUL-18 16:30:00 to 11-JUL-18 20:00:00 (MST-7)
Location: LIRIM
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Scattered thunderstorms with very heavy rain developed over the central deserts during the afternoon and early evening hours on July 11th, and they led to episodes of flooding and flash flooding to the south of Phoenix.  Some of the significant flash flooding occurred along State Route 238 west of the town of Maricopa and east of the county line. According to the Arizona Department of Highways, at 1747MST flash flooding was occurring along State Route 238, near Ralston Road about 4 miles west of State Route 347. Later in the evening, a trained spotter reported flooding in the Vekol Wash near Ralston Road, a bit to the west of of the Ak-Chin Indian Community. The flooding was occurring at 1951 according to the spotter. No injuries were reported due to the flash flooding.