Scattered thunderstorms developed over the southwestern and western deserts of Arizona during the late afternoon and evening hours on September 7th. They affected both Yuma and La Paz Counties as they brought strong and gusty winds to the area along with patchy dense blowing dust. Automated weather stations in far western Yuma County, just east of the lower Colorado River Valley, measured gusts as high as 64 mph. Shortly after 1700MST another mesonet weather station west of the Kofa Mountains measured a gust to 66 mph. No damage was reported due to the strong winds. Finally, at about 1900MST a trained spotter just northeast of Tacna reported dense blowing dust that reduced visibility below one quarter of a mile in a dust storm.

Thunderstorm Wind in YUMA, ARIZONA
From 07-SEP-17 20:12:00 to 07-SEP-17 20:12:00 (MST-7)
Location: FISHERS LNDG
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Scattered thunderstorms developed across portions of western Yuma County during the evening hours on September 7th and some of the stronger storms produced very gusty outflow winds. At 2012MST the mesonet weather station YP017, located 5 miles east-southeast of Martinez Lake, measured a wind gust to 59 mph. The station was also located to the west of highway 95. No damage was reported due to the strong wind gust.

Thunderstorm Wind in LA PAZ, ARIZONA
From 07-SEP-17 20:16:00 to 07-SEP-17 20:16:00 (MST-7)
Location: CIBOLA
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Scattered thunderstorms developed across the western portion of La Paz County during the evening hours on September 7th and some of the stronger storms generated outflow wind gusts in excess of 60 mph. A mesonet weather station in far southern La Paz County, labeled YP013, measured a peak gust to 64 mph at 2016MST. The station was located 5 miles northeast of Martinez lake, northeast of Castle Dome Landing and west of Highway 95. No damage was reported due to the strong wind.

Thunderstorm Wind in LA PAZ, ARIZONA
From 07-SEP-17 17:12:00 to 07-SEP-17 17:12:00 (MST-7)
Location: QUARTZSITE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Scattered thunderstorms developed over the western portion of La Paz County during the afternoon hours on September 7th and some of the stronger storms produced gusty outflow winds in excess of 60 mph. At 1712MST a mesonet weather station labeled YP010 measured a wind gust to 66 mph. The station was located 18 miles west of Palm Canyon, to the west of the Kofa Mountains, and over the southwestern portion of the county. No damage was reported due to the strong wind gust.

Dust Storm in SOUTHWEST DESERTS, ARIZONA
From 07-SEP-17 19:00:00 to 07-SEP-17 20:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed over the east-central portion of Yuma County during the early evening hours, and developed towards the west, affecting the Interstate  8 corridor to the east of the town of Wellton. The storms produced gusty outflow winds in excess of 40 mph which stirred up significant amounts of dust and dirt resulting in dust storm conditions. At 1853MST a trained spotter located 3 miles to the northeast of Tacna reported a dust storm, with visibility lowered to less than one quarter of a mile. A Dust Storm Warning was issued for the Interstate 8 corridor starting at about 1900MST and remained in effect through 2000MST. Although the dense blowing dust presented very dangerous driving conditions for motorists on the interstate, no accidents were reported as a result of the sharply reduced visibility.