Deep monsoon moisture over northern Arizona caused scattered thunderstorms with heavy rain.

Heavy Rain in NAVAJO, ARIZONA
From 15-JUL-18 00:00:00 to 15-JUL-18 03:00:00 (MST-7)
Location: PINON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain over the Polacca Wash basin caused a rise of 1.61 feet between 300 AM MST (4 AM MDT) and 325 AM MST (325 AM MDT) at the river gauge (POLA3) near Second Mesa. The maximum gauge reading was 7.42 feet. By 1030 AM MST, the water had receded to a level of 6.91.  The gauge is normally dry with a baseline reading of 5.81 feet.

Flash Flood in COCONINO, ARIZONA
From 15-JUL-18 13:15:00 to 15-JUL-18 14:45:00 (MST-7)
Location: (FLG)FLAGSTAFF ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain from thunderstorms flooded urban roadways and low-lying areas in much of east Flagstaff.  A wash (Switzer Canyon Wash) flooded the intersection of Butler and 4th Street.

Flash Flood in APACHE, ARIZONA
From 15-JUL-18 14:45:00 to 15-JUL-18 16:45:00 (MST-7)
Location: GANADO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Arizona Department of Transportation reported flooding of State Route 264 at milepost 438 near Burnside due to heavy rain that fell in the region. The road was closed for a couple hours as a preventative measure.

Flash Flood in YAVAPAI, ARIZONA
From 15-JUL-18 15:30:00 to 15-JUL-18 17:30:00 (MST-7)
Location: ASHFORK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Ash Fork reported 1.76 inches of rain between 200 PM and 4:36 PM. This led to flash flooding of Double A Ranch Road with 3-4 inches of standing water on the roadways. Portions of dirt roadways were washed away as a result of the localized flooding.

Flash Flood in NAVAJO, ARIZONA
From 15-JUL-18 17:00:00 to 15-JUL-18 18:15:00 (MST-7)
Location: WEPO VLG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Hotevilla measured 1.75 inches of rainfall in an hour. Water was flowing over local roads with some flood damage to private roads.

Flash Flood in COCONINO, ARIZONA
From 15-JUL-18 03:30:00 to 15-JUL-18 08:30:00 (MST-7)
Location: MARBLE CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Paria River Gauge at Lees Ferry showed a 3 foot rise at 645 AM. It is estimated that this flood crest entered Arizona (from thunderstorms in Utah) around 345 AM.

Flash Flood in YAVAPAI, ARIZONA
From 15-JUL-18 16:15:00 to 16-JUL-18 04:00:00 (MST-7)
Location: CORDES
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Big Bug Creek experienced flash flood conditions during the mid-afternoon which lasted for approximately two hours. Water rose out the banks and flooded East Antelope Road. Much of the rain fell over the Goodwin Fire scar. Winds also gusted up to 45 MPH between 315 and 415 PM MST. The flood waters continued on down the Agua Fria Wash for another 6 to 9 hours.  This water eventually flowed into Black Canyon Creek near Black Canyon City. The Agua Fria River gauge at Old Black Canyon City Highway showed a rapid rise of 2.2 feet at 230 AM on July 16.

Flash Flood in YAVAPAI, ARIZONA
From 15-JUL-18 18:45:00 to 15-JUL-18 20:00:00 (MST-7)
Location: ENTRO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Glassford Hill Road was close next to Bradshaw High School due to mud from new subdivision. Brawshaw High School had water in the gym, likely from area flooding.

Heavy Rain in COCONINO, ARIZONA
From 15-JUL-18 12:00:00 to 15-JUL-18 14:20:00 (MST-7)
Location: SUNSET CRATER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2.05 inches of rain between 1220 PM and 220 PM. This caused flash flooding in parts of Flagstaff.  Another spotter measured 3.20 inches of rain in an hour and fifteen minutes at the corner of Elder and King Street (noon to 115 PM MST).

Flash Flood in YAVAPAI, ARIZONA
From 15-JUL-18 16:30:00 to 15-JUL-18 17:45:00 (MST-7)
Location: GOODWIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lynx Creek immediately upstream from Fain Lake (in Fain Park) was experiencing flash flooding conditions that were causing the creek water to flow out of the banks. The flooding continued upstream to Costco. Flooding in the Diamond Valley area. Diamond Drive was washed out with significant flooding over roads in the neighborhood.