Isolated to scattered monsoon thunderstorms developed across portions of the central deserts to the southwest of Phoenix during the evening hours on September 1st. In addition to strong gusty outflow winds, some of the stronger storms produced very heavy rain with peak rain rates in excess of one inch per hour. The heavy rains led to episodes of flash flooding, some of which occurred near the town of Gila Bend. According to the Arizona Department of Highways, flash flooding  was observed just east of Gila Bend along State Route 238, and was also observed along the Centennial Wash southeast of Buckeye and east of Highway 85. In addition, a mesonet station 3 miles north of Gila Bend reported that water exceeded alarm stage on Sand Tank Wash, impacting Indian Road. There were no reports of accidents or injuries due to the flash flooding.

Flash Flood in MARICOPA, ARIZONA
From 01-SEP-19 18:45:00 to 01-SEP-19 23:45:00 (MST-7)
Location: SIL MURK
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

Scattered monsoon thunderstorms developed during the evening hours across the lower deserts to the southwest of the greater Phoenix metropolitan area. Some of the stronger storms developed locally heavy rains with peak rain rates well in excess of one inch per hour. The heavy rain resulted in flash flooding around the community of Gila Bend. According to mesonet data from the Maricopa County Flood Control District, at 2142MST the Sand Tank Wash exceeded the alarm stage with a reading of 2.3 feet. The mesonet gage was located about 3 miles north of Gila Bend. The high level of flow associated with the flooding affected Indian Road. A Flash Flood Warning was in effect at the time of the flooding and was issued at 2042MST.

Flash Flood in MARICOPA, ARIZONA
From 01-SEP-19 18:45:00 to 01-SEP-19 23:45:00 (MST-7)
Location: BOSQUE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Department of Highways

Scattered monsoon thunderstorms developed across the lower deserts to the southwest of Phoenix during the evening hours on September 1st. Some of the stronger storms produced intense rainfall with peak rain rates in excess of one inch per hour. The heavy rain led to flash flooding to the east of Gila Bend, which impacted Highway 238. According to the Arizona Department of Highways, at 2018MST flash flooding 4 miles east of Gila Bend caused widespread flooding of low lying areas along State Route 238 between Mile Markers 2 and 5. As a result of the flash flooding, the highway became closed at Mile Marker 2 and a water rescue was needed. A Flash Flood Warning had been in effect for the area at the time of the flooding and was originally issued at 1842MST. No accidents or injuries were reported due to the flash flooding.

Flash Flood in MARICOPA, ARIZONA
From 01-SEP-19 20:00:00 to 01-SEP-19 23:45:00 (MST-7)
Location: ARLINGTON
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Department of Highways

Scattered monsoon thunderstorms developed during the evening hours across the lower desert to the southwest of Phoenix. Some of the stronger storms produced intense rainfall with peak rain rates well in excess of one inch per hour. The heavy rain led to some flash flooding to the north of Gila Bend and to the west of Highway 85. According the the Arizona Department of Transportation, at 2230MST flash flooding along Centennial Wash resulted in the closure of old US Highway 80 at Agua Caliente Road. In addition, a mesonet gage 6 miles upstream at Centennial Railroad reported that alarm stage was exceeded with a peak stage height of 7.48 feet reached. A Flash Flood Warning was in effect at the time of the flooding and was issued at 1951MST. No accidents or injuries were reported due to the flooding.