Isolated strong thunderstorms developed to the southeast of the greater Phoenix metropolitan area during the late afternoon and evening hours on September 6th. Some of the storms generated gusty outflow winds in excess of 50 mph which spread to the northwest and into the greater Phoenix area, causing dense blowing dust and dust storm conditions. The storms also generated damaging microburst winds and locally heavy rain, affecting locations such as San Tan Valley, San Tan Mountain Park and Seville. Later in the evening new thunderstorms developed across the northern portion of the Phoenix area, causing heavy rain and flooding in communities such as Peoria and prompting the issuance of a Flash Flood Warning.

Dust Storm in CENTRAL DESERTS, ARIZONA
From 06-SEP-14 17:15:00 to 06-SEP-14 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed to the southeast of the greater Phoenix area during the afternoon hours on September 6th, and they generated strong and gusty outflow winds in excess of 50 mph. The winds spread to the northwest and moved across portions of northwest Pinal county, stirring up significant amounts of dust and leading to dust storm conditions. Dense blowing dust affected the communities of Coolidge and Casa Grande. At about 1715MST, a trained spotter 8 miles northwest of Casa Grande reported a dust storm with visibility less than one eighth of a mile. At the same time, another spotter near Coolidge reported visibility at one quarter mile in a dust storm. Shortly thereafter, a Dust Storm Warning was issued for the area.

Thunderstorm Wind in PINAL, ARIZONA
From 06-SEP-14 17:30:00 to 06-SEP-14 17:30:00 (MST-7)
Location: BAPCHULE
Magnitude: 52.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed in the area around San Tan Valley during the late afternoon hours on September 6th, and the stronger storms produced gusty outflow winds of at least 60 mph. According to a trained weather spotter 2 miles southeast of San Tan Mountain Park, a wind gust of 60 mph was measured on his Davis weather station. The strong gust also slightly damaged the roof on his house.

Thunderstorm Wind in MARICOPA, ARIZONA
From 06-SEP-14 17:30:00 to 06-SEP-14 17:30:00 (MST-7)
Location: HIGLEY
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across the far southeast portion of the greater Phoenix metropolitan area during the afternoon hours on September 6th and they affected communities such as Chandler, San Tan Valley and Queen Creek. The stronger storms produced gusty and damaging outflow winds, estimated to be in excess of 60 mph at times. A trained weather spotter located about 2 miles northwest of the Seville Country Club reported thunderstorm wind damage. Wind gusts, estimated to be nearly 65 mph, blew off a section of the roof of a trailer in an RV park. Fortunately, no injuries were reported.

Heavy Rain in PINAL, ARIZONA
From 06-SEP-14 17:00:00 to 06-SEP-14 20:00:00 (MST-7)
Location: MAGMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the southeast portion of the greater Phoenix metropolitan area during the late afternoon hours on September 6th; the stronger storms generated locally heavy rainfall with peak rain rates in excess of 2 inches per hour. Some of the heaviest rain fell in the area around San Tan Valley. At 1830MST, a trained spotter 2 miles southeast of San Tan Valley measured 1.24 inches of rain in a span of 45 minutes. He indicated that there was curb to curb flooding in Johnson Ranch. At 1740MST, another trained spotter 2 miles southeast of San Tan Mountain Park measured 2.10 inches of rain in 45 minutes and he indicated that heavy rain was still occurring. The heavy rain led to the issuance of both an Urban and Small Stream Flood Advisory and a Flash Flood Warning for portions of northern Pinal county including the area around San Tan Valley.

Thunderstorm Wind in PINAL, ARIZONA
From 06-SEP-14 17:25:00 to 06-SEP-14 17:35:00 (MST-7)
Location: MAGMA
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed across northern Pinal County during the afternoon hours on September 6th, and some of them affected the community of San Tan Valley. The stronger storms produced gusty and damaging microburst winds, estimated to be in excess of 60 mph at times. According to a trained weather spotter just south of San Tan Valley, gusty winds estimated at 65 mph downed multiple trees and flagpoles. In addition, the strong winds caused some roof damage. No injuries were reported.

Heavy Rain in MARICOPA, ARIZONA
From 06-SEP-14 19:30:00 to 06-SEP-14 22:30:00 (MST-7)
Location: PHOENIX DEER VLY ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with heavy rain developed across the northern portion of the greater Phoenix area during the early evening hours on September 6th, and some of the heaviest rain occurred in the community of Peoria. At 2043MST, a trained spotter 3 miles southeast of Peoria measured 1.65 inches within 45 minutes. The heavy rain led to significant street flooding in Peoria which resulted in the issuance of an Urban and Small Stream Flood Advisory. At 2115MST, a report was received from local broadcast media indicating that over one foot of flooding was occurring from 5100W to 5500W on Pinnacle Peak Road. The street flooding, located in an area about 4 miles east of Peoria, encompassed approximately a one half mile stretch of road.