Thunderstorms developed across the higher terrain of eastern Arizona during the afternoon hours on July 30th, and during the evening some of them spread westward and into the south-central deserts. The stronger storms generated gusty outflow winds in excess of 40 mph; the winds were sufficient to stir up significant amounts of blowing dust which then resulted in dust storm conditions. During the evening hours, there were numerous reports, both from trained spotters as well as the public, of dust storms which moved through the greater Phoenix metropolitan area as well as the more open desert to the south and southwest of central Phoenix. Additionally, dust storms were indicated by automated weather station observations; at 2051MST the Gila Bend ASOS reported visibility down to one quarter of a mile in blowing dust. Numerous Dust Storm Warnings as well as Dust Advisories were issued as a result of the dense blowing dust. Fortunately, no accidents were reported due to the severely restricted visibility and hazardous driving conditions.

Dust Storm in NORTHWEST VALLEY, ARIZONA
From 30-JUL-18 19:15:00 to 30-JUL-18 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms moved across the western portion of the greater Phoenix area during the evening hours on July 30th; some of the stronger storms generated gusty outflow winds well in excess of 40 mph. The gusty winds stirred up dense blowing dust which led to dust storm conditions over northwest valley communities such as Surprise and Waddell. At 1939MST the public reported that visibility had dropped to 600 feet in a dust storm about 2 miles southwest of Waddell. The dust storm was near the intersection of Cactus Road and Sarival Avenue, just east of the Loop 303 freeway. A Dust Storm Warning was not in effect at the time of the report.

Dust Storm in CAVE CREEK/NEW RIVER, ARIZONA
From 30-JUL-18 18:30:00 to 30-JUL-18 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed over the higher terrain of eastern Arizona during the late afternoon hours on July 30th and during the evening they spread into the north and northwest portions of the greater Phoenix area. Some of the stronger storms generated gusty outflow winds up to or in excess of 40 mph; the gusty winds generated areas of dense blowing dust that affected the Carefree and Cave Creek communities. At 1845MST a trained spotter located about 6 miles southwest of Cave Creek reported visibility down to 100 feet in dense blowing dust. The dust storm was near the intersection of Central Avenue and the Carefree Highway. The spotter reported 40 mph winds at the time of the dust storm. No Dust Storm Warning was in effect at the time of the report.

Dust Storm in GILA BEND, ARIZONA
From 30-JUL-18 20:10:00 to 30-JUL-18 21:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Scattered thunderstorms developed over the central deserts during the evening hours on July 30th and some of the stronger storms generated gusty outflow winds in excess of 50 mph. The gusty winds generated significant amounts of dense blowing dust which led to dust storm conditions in the Gila Bend area. At 2051MST, the official ASOS weather station in Gila Bend measured visibility down to one quarter of a mile in blowing dust. A Dust Storm Warning was issued for the area at 2010MST and it remained in effect through 2115MST.

Dust Storm in NORTHWEST PINAL COUNTY, ARIZONA
From 30-JUL-18 19:30:00 to 30-JUL-18 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms developed across the central deserts during the evening hours on July 30th; some of the stronger storms produced gusty outflow winds in excess of 50 mph. The gusty winds generated significant blowing dust which led to dust storm conditions over the deserts to the south and southeast of central Phoenix. Dust storm conditions were observed over portions of northwest Pinal County; at 1945MST local law enforcement reported that State Route 347 was closed both northbound and southbound  between Riggs Road and Casa Blanca Road due to dense blowing dust. No accidents were reported due to the severely restricted visibility. A Dust Storm Warning  was not yet in effect, but was later issued at 2025MST for the area.

Dust Storm in EAST VALLEY, ARIZONA
From 30-JUL-18 18:45:00 to 30-JUL-18 19:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed over the higher terrain of eastern Arizona during the late afternoon and early evening hours and some of the stronger storms produced gusty outflow winds in excess of 50 mph. The strong winds generated areas of dense blowing dust which led to dust storm conditions over portions of the East Valley. At 1900MST, a trained spotter located near the intersection of the Loop 202 freeway and Val Vista Drive reported visibility down to 100 yards in a dust storm. The dust storm was occurring at the intersection of Val Vista Drive and Thomas Road. A Dust Storm Warning was not in effect for the area at the time of the report.

Dust Storm in SCOTTSDALE/PARADISE VALLEY, ARIZONA
From 30-JUL-18 19:00:00 to 30-JUL-18 19:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms moved across the eastern portion of the greater Phoenix metropolitan area during the evening hours on July 30th; some of the stronger storms generated gusty outflow winds in excess of 50 mph. The gusty winds generated areas of dense blowing dust that resulted in dust storm conditions over communities such as Scottsdale. At about 1915MST, a trained spotter located 2 miles south of Scottsdale reported one quarter mile visibility in a dust storm at the intersection of 74th Street and McDowell Road. Later, at 1938MST, another trained spotter 2 miles southeast of North Scottsdale reported visibility down to one quarter mile in a dust storm. The dense blowing dust was occurring near the intersection of the 101 Freeway and Cactus Road. A Dust Storm Warning was not in effect at the time of the report. No accidents were reported due to the sharply restricted visibility.