Thunderstorms continued to develop across south central Arizona during the afternoon hours on August 12th, and they persisted well into the evening. Many of the storms affected the greater Phoenix metropolitan area. Due to excessively moist atmospheric conditions, a Flash Flood Watch was in effect from noon August 12th through 5 am on Wednesday August 13th. Many of the thunderstorms produced locally heavy rain with rainfall rates in excess of 2 inches per hour at times. The heavy rain led to urban flooding, flash flooding, and eventually areal flooding which affected much of the greater Phoenix area, especially the southeast and south central portions.

Heavy Rain in MARICOPA, ARIZONA
From 12-AUG-14 16:00:00 to 12-AUG-14 18:00:00 (MST-7)
Location: GILBERT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered to numerous thunderstorms developed across the southeastern portions of the greater Phoenix metropolitan area during the afternoon hours on August 12th, and they affected communities such as Mesa and Gilbert. The stronger storms produced locally heavy rainfall with peak rain rates in excess of 2 inches per hour. The heavy rain led to significant urban flooding; at 1639MST a trained spotter 4 miles northwest of Gilbert reported very heavy rain and street flooding at the intersection of Baseline Road and Gilbert Road. The rain was so heavy that visibility was lowered to near zero miles. A Flash Flood Warning was in effect at the time of the spotter report.

Heavy Rain in MARICOPA, ARIZONA
From 12-AUG-14 17:00:00 to 12-AUG-14 19:00:00 (MST-7)
Location: PHOENIX
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorms with locally heavy rain developed across the central portion of the greater Phoenix area during the afternoon and evening hours on August 12th; peak rain rates with the heavier showers approached 2 inches per hour at times. The heavy rain led to flood damage at some of the buildings in downtown Phoenix including the Boys & Girls Club of Metro Phoenix Administration Building located at 24th Street and Thomas Road. According to an on-line article posted at the AZFamily.Com website, heavy rain caused the roof of the building to cave in. A number of ceiling panels collapsed, leaving exposed ductwork and wiring. Standing water was left about six inches deep on the floor. Collapsed air-conditioning ductwork was hanging from the ceiling and appeared ready to fall to the ground at any second. Referring to the water damage, a Boys & Girls Club spokeswoman Lariana Forsythe said It's a disaster. Although damage to the building was considerable, nobody was hurt. Another on-line article reported that the Children's Museum of Phoenix was damaged after thousands of gallons of water poured into its atrium during the monsoon storms. The museum, located near Seventh and Van Buren Streets in downtown Phoenix, closed its first floor and three-story climbing structure due to the water damage. The flooding resulted in four inches of water on the main exhibit floor which ruined the carpet. Approximately 1000 carpet squares are needed to replace the damaged flooring, at 50 dollars each.

Flash Flood in PINAL, ARIZONA
From 12-AUG-14 16:00:00 to 12-AUG-14 18:30:00 (MST-7)
Location: QUEEN VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms continued to develop across the far southeast portion of the greater Phoenix area during the late afternoon hours on August 12th, and some of the storms produced locally heavy rainfall with rain rates well in excess of 1 inch per hour at times. Some of the storms affected the Queen Valley area, causing local streams and washes to run heavily. At 1713MST, a trained weather spotter 1 mile southwest of Queen Valley reported very heavy rainfall. He also mentioned that Queen Creek was running heavily in Queen Valley.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-14 17:00:00 to 12-AUG-14 19:15:00 (MST-7)
Location: PHOENIX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the southeast portions of the greater Phoenix area during the afternoon hours on August 12th, and some of them produced locally heavy rainfall. The storms continued to build towards the west, producing very heavy rainfall across portions of central Phoenix. At 1803MST, a trained spotter located 2 miles southeast of Phoenix reported significant street flooding between 12th street and 16th street. The flooding produced very hazardous driving conditions for area motorists.

Flash Flood in MARICOPA, ARIZONA
From 12-AUG-14 17:00:00 to 12-AUG-14 21:00:00 (MST-7)
Location: GUADALUPE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered to numerous showers and thunderstorms produced locally heavy rainfall across the south central portion of the greater Phoenix metropolitan area during the afternoon and evening hours on August 12th. Rainfall rates were measured to be in excess of 1 inch per hour, and isolated locations received storm total rainfall greater than 3 inches. Some of the hardest hit communities included Laveen, Ahwatukee and south Phoenix. At 1830MST, a trained spotter located 1 mile northeast of Ahwatukee measured 1.05 inches of rain within one hour, and indicated that in addition to street flooding, the local drainage washes were running. Later, at 1930MST, another trained spotter 3 miles west of South Mountain Park measured an afternoon storm total rainfall of 3.2 inches. At the same time, he reported that 27th Avenue was flooded with water 18 inches deep between Dobbins and Baseline Roads. There were numerous stalled cars due to the flash flooding. According to an on-line article posted at the AZFamily.Com website, a flooded wash trapped 11 motorists near South 19th Avenue and Dobbins Road. At 1830MST, at the height of the storm, the raging waters came out of nowhere according to Phoenix Fire Captain Ruben Saavedra, and trapped the motorists. Rescue crews had a difficult time getting to the victims due to an overflowing nearby canal. The rescue crews indicated that the victims were shaken but not injured. Additionally, the storms damaged South Mountain Park and caused a major rock slide on the park's Summit Road at the 2 mile mark, according to David Urbinato with the Phoenix Parks and Recreation Department. Many boulders moved in the slide were 2 feet long by 1 foot wide, and the debris field exceeded 6 feet at its deepest point. Six vehicles were trapped on the Summit Road by the slide, and the Phoenix Fire Department transported these people off the mountain by 2100MST. The slide forced the closure of the Central Avenue entrance to the park due to debris removal. No injures were reported due to the flash flooding.

Flood in MARICOPA, ARIZONA
From 12-AUG-14 19:45:00 to 13-AUG-14 04:30:00 (MST-7)
Location: WEST CHANDLER
Flood cause: Heavy Rain
Property damage: 2.00M
Crop damage: 0.00K
Reported by: Law Enforcement

Scattered to numerous thunderstorms produced locally heavy rain across the south central portions of the greater Phoenix metropolitan area during the afternoon and evening hours on August 12th. Peak rainfall rates were well in excess of one inch per hour at times, and storm total rainfall amounts exceeded 3 inches. Some of the hardest hit communities included Laveen, Ahwatukee and South Phoenix. At 1930MST, a trained weather spotter 3 miles northwest of South Mountain Park measured an afternoon storm total rainfall of 3.2 inches. According to the Maricopa County Sheriff's office, heavy rain led to flash flooding and subsequently areal flooding. Numerous roads were flooded and closed, including the intersections of 27th Avenue and Cheyenne Drive, and 45th Avenue and Ivanhoe Street. Many homes in the area, especially those along Dobbins Road between 19th Avenue and 51st Avenue, suffered significant flood damage, as water 1-3 feet filled up their residences. The flooding also produced significant damage to the SRP water system according to SRP spokesman Jeff Lane. The flooding prompted the issuance of an Areal Flood Warning which remained in effect through the early morning hours on August 13th. No injuries were reported due to the flooding.

Heavy Rain in MARICOPA, ARIZONA
From 12-AUG-14 17:00:00 to 12-AUG-14 18:30:00 (MST-7)
Location: SUN CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms developed across the northwest portion of the greater Phoenix metropolitan area during the late afternoon and early evening hours on August 12th, and the stronger storms produced locally heavy rainfall which led to urban flooding. At 1828MST at trained weather spotter 1 mile southeast of Peoria estimated that one half inch of rain fell within 30 minutes. The locally heavy rain also caused local street flooding. At the time, a Flash Flood Warning was in effect.