Moisture had started to increase across portions of southwest Arizona on September 8th ahead of Hurricane Linda, which was still well off to the south of Arizona. The ample amounts of moisture combined with elevated instability and upper level wind values allowed for scattered thunderstorms to form over southwest Arizona during the afternoon and evening hours. Some of the storms generated gusty and damaging winds around Yuma, sufficient to down trees and power poles. During the evening hours, very heavy rainfall developed in Yuma; a spotter report in Somerton indicated that over 4 and one half inches fell within a 2 hour period. The heavy rain led to evening flash flooding and flooding across western Yuma county, affecting the towns of Yuma and Somerton. Fortunately, no injuries resulted from the flash flooding.

Thunderstorm Wind in YUMA, ARIZONA
From 08-SEP-15 16:00:00 to 08-SEP-15 16:00:00 (MST-7)
Location: ARABY
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms developed in the Yuma area during the afternoon hours on September 8th, and some of the stronger ones produced damaging microburst winds with gusts estimated as high as 70 mph. According to a local broadcast media report, at 1600MST, strong winds uprooted a large tree between Yuma and the Fortuna Foothills, just south of highway 95 and east of South Ave 9E. The large tree blew over and fell onto a house, causing significant damage to the house. No injuries were reported.

Thunderstorm Wind in YUMA, ARIZONA
From 08-SEP-15 16:30:00 to 08-SEP-15 16:35:00 (MST-7)
Location: (YUM)YUMA INTL ARPT
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Utility Company

Scattered thunderstorms developed across southwestern Yuma county during the afternoon hours on September 8th, and some of them affected the downtown Yuma area. Due to elevated moisture and instability values, the stronger storms produced damaging microburst winds with gusts estimated as high as 70 mph. According to a report from a local utility company, damaging microburst winds downed 43 power poles just north of the Yuma International Airport, between Avenues 1E and 3E. A Severe Thunderstorm Warning was not yet in effect, but a Significant Weather Advisory had been issued for the Yuma area when the power poles were blown down.

Flash Flood in YUMA, ARIZONA
From 08-SEP-15 18:00:00 to 08-SEP-15 21:00:00 (MST-7)
Location: GADSDEN
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms affected community of Yuma as well as surrounding communities such as Somerton during the late afternoon and evening hours on September 8th. Due to elevated moisture values, partially a result of tropical moisture from Hurricane Linda starting to move into southern Arizona, the stronger storms produced very heavy rainfall with peak rain rates in excess of 2 inches per hour. A trained spotter 3 miles northeast of Somerton measured 4.6 inches of rain within 2 hours ending at 1900MST. The heavy rain led to flash flooding in the Yuma area and resulted in the issuance of a Flash Flood Warning at 1802MST. At 2000MST, local broadcast media reported that people were leaving flooded houses south of highway 95 between Joshua Street and Bingham Avenue. The flash flooding took place about 1 mile southeast of the town of Somerton. Fortunately there were no injuries reported due to the flooding.

Thunderstorm Wind in YUMA, ARIZONA
From 08-SEP-15 18:11:00 to 08-SEP-15 18:11:00 (MST-7)
Location: SOMERTON
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the Yuma area during the late afternoon and evening hours on September 8th, and due to elevated amounts of moisture and instability, the stronger storms produced gusty and damaging microburst winds in excess of 60 mph. According to a trained spotter located about 4 miles to the southeast of Somerton, microburst winds estimated at 65 mph downed a number of palm trees. Additionally, the strong winds uprooted a fruit tree and knocked a number of branches off of trees in the area. The branches had diameters between 4 and 6 inches.