Scattered thunderstorms developed over portions of the greater Phoenix metropolitan area, including the community of Glendale, during the late afternoon and evening hours on July 11th. Atmospheric conditions on this day were favorable for both gusty and damaging thunderstorm outflow winds as well as locally heavy rainfall. Reports from the public and trained spotters indicated locally heavy rains with peak rain rates approaching 2 inches per hour. This resulted in street flooding as well as the issuance of multiple flood advisories for the Phoenix area. In addition, some of the stronger storms produced gusty and damaging down burst winds; trees were damaged in the community of Surprise and a Safeway grocery store in Glendale suffered wind and water damage. The damage was a contributing factor to a fire which almost completely destroyed the store.

Heavy Rain in MARICOPA, ARIZONA
From 11-JUL-18 17:15:00 to 11-JUL-18 19:30:00 (MST-7)
Location: GLENDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms developed over the central and western portions of the greater Phoenix area, including the community of Glendale, during the late afternoon and evening hours on July 11th. The stronger storms were able to produce intense rain with peak rain rates in excess of 2 inches per hour. At 1744MST a trained spotter located about 3 miles east of Glendale measured 0.81 inches of rain within a 15 minute period. The heavy rain led to local street flooding in the area. The heavy rain fell just south of Northern Avenue and just east of 39th Avenue. An Urban and Small Stream Flood Advisory was issued as a result at 1728MST and it remained in effect until 1930MST. In addition, another trained spotter further to the northwest, about 4 miles northeast of Sun City, measured one inch of rain within a 30 minute period ending at 1730MST. Flash flooding was not reported in the area.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-JUL-18 18:28:00 to 11-JUL-18 18:28:00 (MST-7)
Location: WADDELL
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Scattered thunderstorms developed over western portions of the greater Phoenix area during the late afternoon hours on July 11th and some of them affected the areas around the community of Surprise. The stronger storms produced gusty and damaging outflow winds estimated to be in excess of 50 mph. According to a storm chaser located west of Surprise and northwest of Luke Air Force Base, gusty winds estimated to be 60 mph or higher downed a number of trees near the intersection of Bell Road and the Loop 303 highway. No injuries were reported as a result of the wind damage.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-JUL-18 17:50:00 to 11-JUL-18 17:50:00 (MST-7)
Location: GLENDALE
Magnitude: 52.00 EG
Property damage: 2.00M
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorms developed over the western portion of the greater Phoenix area, including the community of Glendale, during late afternoon hours on July 11th. Some of the stronger storms produced intense rainfall as well as gusty damaging outflow winds. According to a report from the Phoenix Fire Department and Rescue, a down burst occurred directly overhead of a major grocery store located about 3 miles east of the town of Glendale. Winds were estimated between 40 and 60 mph. In addition, very heavy rain occurred with rainfall totals estimated to be about one inch within a 30 minute period. At 1730MST, a fire occurred at the Safeway grocery store and the winds and rain were considered to be contributing factors to the fire. The Safeway store, near the intersection of 35th Avenue and Northern Avenue and just west of Interstate 17, was completely destroyed due to the fire. Fortunately, all of the people within the store were evacuated and no injuries occurred to either store patrons or fire and rescue personnel.