A large area of low pressure centered over southeast California brought convectively active weather to south central Arizona, including the greater Phoenix metropolitan area, during the day on October 6th. Wind fields were stronger than normal due to the proximity of the upper low; moisture and instability were elevated as well, and these factors combined to produce scattered thunderstorms during the afternoon hours across the central deserts. Some of the stronger thunderstorms produced large hail with diameters greater than one and one half inches. Trained weather spotters reported funnel clouds near Perryville and over the Estrella mountains. Heavy thunderstorm rainfall led to episodes of urban flooding and flash flooding; multiple Flood Advisories and Flash Flood Warning were issued across Maricopa county. Additionally, some of the storms produced strong winds; a wind gust to 60 mph was measured at the Coolidge airport at 1540MST.

Thunderstorm Wind in PINAL, ARIZONA
From 06-OCT-15 15:40:00 to 06-OCT-15 15:40:00 (MST-7)
Location: COOLIDGE FLORENCE AR
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Scattered thunderstorms developed across the central deserts during the afternoon hours on October 6th, and some of the stronger storms generated gusty outflow winds which affected the community of Coolidge. At 1540MST, the official ASOS weather station at the Coolidge airport measured a wind gust to 60 mph. A Severe Thunderstorm Warning was issued for the Coolidge area at 1525MST due to the strong thunderstorms; the warning was in effect until 1600MST.

Hail in PINAL, ARIZONA
From 06-OCT-15 15:00:00 to 06-OCT-15 15:10:00 (MST-7)
Location: ELEVEN MILE CORNER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Scattered thunderstorms developed across the central deserts during the afternoon hours on October 6th; due to favorable atmospheric conditions aloft, one of the stronger storms generated large hail near the community of Casa Grande. According to local law enforcement, at 1510MST golf ball sized hail was measured between Randolf and Casa Grande. The largest stones had a diameter of 1.75 inches.

Hail in PINAL, ARIZONA
From 06-OCT-15 15:21:00 to 06-OCT-15 15:25:00 (MST-7)
Location: ELEVEN MILE CORNER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the central deserts of Arizona during the afternoon hours on October 6th. Due to a combination of strong winds aloft and elevated instability values, the stronger storms produced large hail which affected northwest Pinal county. According to a trained weather spotter, at about 1520MST hailstones the size of a half dollar were measured at the Pinal County fairgrounds, located just to the east of the town of Casa Grande. The largest stones had a diameter of 1.25 inches.

Funnel Cloud in MARICOPA, ARIZONA
From 06-OCT-15 12:10:00 to 06-OCT-15 12:34:00 (MST-7)
Location: LIBERTY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon hours on October 6th; due to stronger than normal wind fields aloft and elevated instability some of the stronger storms produced funnel clouds. According to a trained weather spotter located just to the west of Estrella Mountain Regional Park, a funnel cloud developed in the Rainbow Valley area at about 1210MST. Almost one half hour later, another trained spotter 3 miles north of Perryville reported a funnel cloud just to the north of the Papago Freeway. The funnel clouds were short lived and they never reached the ground.

Tornado in MARICOPA, ARIZONA
From 06-OCT-15 12:34:00 to 06-OCT-15 12:40:00 (MST-7)
Location: LIBERTY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the afternoon hours on October 6th; due to stronger than normal wind fields aloft and elevated instability some of the stronger storms initially produced funnel clouds. However, according to a trained weather spotter and emergency responders  located just to the west of Estrella Mountain Regional Park, one of the funnel clouds continued to develop until it touched the ground, forming a land spout tornado. The tornado, which formed in the Rainbow Valley area, was very short lived with a path length less than one mile; no damage was reported.

Heavy Rain in MARICOPA, ARIZONA
From 06-OCT-15 13:45:00 to 06-OCT-15 14:45:00 (MST-7)
Location: NEW RIVER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the northern portions of the greater Phoenix area during the early afternoon hours on October 6th; the storms affected the Interstate 17 corridor as well as the community of Anthem. Some of the stronger storms produced locally heavy rainfall with rain rates well in excess of one inch per hour. The heavy rain led to episodes of urban street flooding south of the community of Anthem. According to a trained weather spotter located 4 miles southeast of Anthem, at 1415MST heavy rain led to street flooding and field flooding along the Carefree Highway in the vicinity of Interstate 17. At the time of the flooding, a Flood Advisory was in effect; although the heavy rain had ended by 1445MST, the advisory remained in effect until approximately 1645MST.

Flash Flood in MARICOPA, ARIZONA
From 06-OCT-15 13:30:00 to 06-OCT-15 15:30:00 (MST-7)
Location: LIBERTY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Scattered thunderstorms developed across the greater Phoenix metropolitan area during the early afternoon hours on October 6th. Some of the stronger storms produced locally heavy rainfall with rain rates in excess of one inch per hour. The heavy rain led to episodes of flooding and flash flooding to the west of Estrella Mountain Regional Park and to the south of the Gila River. According to a report from the public, flash flooding caused the Waterman Wash to overflow the road at 215th Drive and Narramore Road at approximately 1345MST. The flooding occurred about 3 miles southwest of the town of Liberty. No injuries were reported due to the flooding. Although a Flash Flood Warning was not in effect at the time, there was an Urban and Small Stream Flood Advisory issued for the area starting at 1230MST and running through 1530MST.