An area of low pressure moving across Arizona combined with elevated amounts of moisture and instability to produce scattered to numerous showers and thunderstorms across south central Arizona during the afternoon and evening hours on October 18th. Much of the greater Phoenix metropolitan area was impacted by the thunderstorms, which produced gusty and damaging outflow winds in excess of 60 mph. The strong winds produced damage across the Phoenix area, knocking down trees, power poles and other structures. The storms also produced significant amounts of moderate to large hail, with hailstone diameters reaching as large as one and one half inches. Heavy rain also occurred, leading to some urban street flooding. No flash flooding was observed, however.

Hail in MARICOPA, ARIZONA
From 18-OCT-15 16:20:00 to 18-OCT-15 16:30:00 (MST-7)
Location: PHOENIX DEER VLY ARP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon hours on October 18th, and some of the stronger storms affected the area around the town of Peoria. Due in part to elevated levels of moisture and instability, some of the storms produced large hail. Around 1625MST, multiple reports from trained weather spotters and broadcast media reported moderate to large hail across northern portions of Peoria. One of the broadcast media reports estimated hailstones with a diameter of one inch in the area about 5 miles northeast of central Peoria, near Happy Valley road and 43rd Avenue. Other trained spotters in the area measured hailstones ranging in size from three quarters of an inch to one inch. No damage reports were received as a result of the large hail.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 16:00:00 to 18-OCT-15 16:30:00 (MST-7)
Location: GLENDALE
Magnitude: 60.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed over the greater Phoenix metropolitan area during the afternoon hours on October 18th and some of them affected the town of Glendale. Due in part to elevated levels of moisture and instability, a few of the stronger storms produced gusty and damaging outflow winds. According to a trained weather spotter 2 miles southeast of central Glendale, gusty winds estimated to be in excess of 60 mph downed multiple power poles near the intersection of 51st Avenue and Camelback Road. This occurred near 1600MST. About one half hour later, a public report received via Facebook indicated more power poles were downed about 2 miles to the north, near the intersection of 51st Avenue and Glendale Avenue. At the same time the public report was received, local broadcast media reported multiple power poles downed along Camelback Road from 51st Avenue westward to 59th Avenue. Finally, at 1625MST local broadcast media reported a large tree downed near the intersection of Highway 60 and Glendale Avenue.

Hail in PINAL, ARIZONA
From 18-OCT-15 14:30:00 to 18-OCT-15 14:36:00 (MST-7)
Location: STANFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An area of low pressure moving across Arizona acted upon elevated moisture and instability to produce scattered thunderstorms across the central deserts during the afternoon hours on October 18th. Some of the storms affected the community of Stanfield. According to a trained weather spotter, at 1436MST a strong storm dropped dime sized hail in Stanfield; the largest stones had a diameter of 0.75 inches. The large hail did not produce any damage.

Hail in MARICOPA, ARIZONA
From 18-OCT-15 16:00:00 to 18-OCT-15 16:10:00 (MST-7)
Location: GLENDALE MUNI ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An area of low pressure moving across central Arizona acted upon elevated amounts of moisture and instability to produce scattered thunderstorms during the afternoon hours on October 18th. Some of the storms affected the central portions of the greater Phoenix metropolitan area including the community of Glendale. According to a trained weather spotter located 3 miles to the northwest of the Metro Center Mall. large hail fell around 1600MST. The spotter described the largest stones as half-dollar sized and he estimated that the diameter of the largest stones ranged from one inch to one and one quarter of an inch. The hailstones fell near the intersection of Sweetwater Avenue and 51st Avenue. The spotter did not mention any damage related to the large hail.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 16:00:00 to 18-OCT-15 16:10:00 (MST-7)
Location: GLENDALE MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix area during the afternoon hours on October 18th, and some of the stronger storms produced gusty outflow winds in excess of 50 mph. Some of the storms affected the community of Glendale. At about 1610MST a trained spotter estimated gusty outflow winds up to 60 mph located about 3 miles to the northwest of the Metro Center Mall. No damage was reported.

Hail in MARICOPA, ARIZONA
From 18-OCT-15 15:58:00 to 18-OCT-15 16:13:00 (MST-7)
Location: GLENDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix area, including the community of Glendale, during the afternoon hours on October 18th. In part due to elevated amounts of moisture and instability, the stronger storms produced large hail ranging in size from golf balls to half-dollars. According to a trained weather spotter located just to the southeast of Glendale Community College, half-dollar sized hailstones fell over a 15 minute period ending at 1613MST. The diameter of the largest stones was measured to be one and one quarter inches. The spotter also indicated that peak winds reached 50 mph, and nearly 1.5 inches of rain fell within a 20 minute period. He did not indicate that significant flooding had occurred.

Hail in MARICOPA, ARIZONA
From 18-OCT-15 16:10:00 to 18-OCT-15 16:10:00 (MST-7)
Location: GLENDALE
Magnitude: 1.50 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon hours on October 18th, and some of the stronger storms affected the community of Glendale. Due in part to elevated levels of moisture and instability, the stronger storms were able to produce large hail. According to a report from the public, large hailstones with diameters estimated to be as large as 1.5 inches fell in central Glendale, near Highway 60 and west Glendale Avenue. Although the large hail did not cause damage, associated strong thunderstorm winds uprooted some medium sized trees in the area.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 16:00:00 to 18-OCT-15 16:10:00 (MST-7)
Location: GLENDALE
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix area during the afternoon hours on October 18th and some of them affected the town of Glendale. Due in part to elevated levels of moisture and instability, the stronger storms produced gusty and damaging outflow winds estimated to be in excess of 50 mph. According to a trained weather spotter located about 2 miles northeast of Glendale, gusty winds up to 60 mph downed some trees and signs at the intersection of 43rd Avenue and Northern Avenue. Branches up to 3 inches in diameter were broken. Another spotter who happened to be an ex-NWS employee reported trees down near the intersection of 55th Avenue and Northern Avenue.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 15:50:00 to 18-OCT-15 15:50:00 (MST-7)
Location: FOWLER
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms developed across the greater Phoenix area during the afternoon hours on October 18th, and some of them affected the town of Glendale. A few of the stronger storms produced gusty and damaging outflow winds estimated to be in excess of 60 mph. According to a report from local broadcast media, the overhead metal canopy at a gas station was blown down by winds estimated to be as high as 65 mph. The gas station was located at the intersection of 59th Avenue and McDowell Road.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 18:00:00 to 18-OCT-15 18:04:00 (MST-7)
Location: WEST CHANDLER
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon hours on October 18th and some of them affected the community of Ahwatukee. A few of the stronger storms produced strong gusty winds estimated to be as high as 60 mph. According to a trained weather spotter located 2 miles south of Ahwatukee, gusty winds blew down multiple medium sized trees near the intersection of Pecos Road and 22nd Street. Dime sized hail was also observed.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 16:25:00 to 18-OCT-15 16:25:00 (MST-7)
Location: GLENDALE
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms moved across the greater Phoenix metropolitan area during the afternoon hours on October 18th, and some of them affected the town of Glendale. Some of the stronger storms produced gusty and damaging outflow winds. According to local broadcast media, a strong gusty estimated to be as high as 65 mph uprooted a very large pine tree near the intersection of Northern Avenue and 43rd Avenue. The large pine tree fell on a nearby house after being uprooted causing damage to the home.

Thunderstorm Wind in MARICOPA, ARIZONA
From 18-OCT-15 16:25:00 to 18-OCT-15 16:25:00 (MST-7)
Location: PHOENIX FARM AERO AR
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Scattered thunderstorms moved across the greater Phoenix area, including central Phoenix, during the afternoon hours on October 18th. Some of the stronger storms generated gusty and damaging outflow winds. According to a local broadcast media report, thunderstorm winds estimated to be at least 60 mph in strength blew over a medium to large sized tree near 51st Avenue and Interstate 10. The tree fell over and landed on the interstate creating a significant hazard for passing motorists. No accidents or injuries were reported as a result of the fallen tree however.

Heavy Rain in MARICOPA, ARIZONA
From 18-OCT-15 17:00:00 to 18-OCT-15 20:40:00 (MST-7)
Location: PHOENIX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon and early evening hours on October 18th, and due to elevated moisture levels in the atmosphere, some of the storms produced locally heavy rainfall. Although the rain was not enough to trigger flash flooding, the heavy amounts led to urban and small stream flooding in the central portions of the Phoenix area. According to a trained spotter, street flooding occurred just west of the Biltmore Fashion Park. At 1840MST he indicated that streets were flooded 8 inches deep on 20th street from Missouri Avenue to Camelback Road, with similar flooding near the intersection of 20th Street and Highland. Urban and Small Stream Flood Advisories were issued as a result of the street flooding.