Thunderstorms developed across portions of south central Arizona during the late morning hours on August 9th, and some of the stronger storms produced locally heavy rainfall with peak rain rates reaching near 2 inches per hour. Some of the heavier rain occurred over the far eastern portion of the greater Phoenix area, in the areas between Apache Junction and Fountain Hills. The heavy rain resulted in episodes of street flooding as well as flash flooding and required the closure of a number of area roads. Multiple flood related products were issued including Flash Flood Warnings and Urban and Small Stream Flood Advisories. No reports of serious accidents or injuries were received due to the flash flooding.

Flash Flood in MARICOPA, ARIZONA
From 09-AUG-16 11:15:00 to 09-AUG-16 14:00:00 (MST-7)
Location: TWIN KNOLLS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorms with heavy rain developed across the eastern portion of the greater Phoenix metropolitan area, including the community of Mesa, during the late afternoon hours on August 9th and peak rain rates with the stronger storms approached 2 inches per hour. The heavy rain led to episodes of flash flooding from East Mesa eastward into Apache Junction. At 1135MST, a National Weather Service employee reported that flash flooding had inundated several portions of Brown Road as well as portions of Loop 202 and these roads were under water. The flooded roads were located roughly 3 miles northeast of East Mesa. A Flash Flood Warning for the area was issued shortly thereafter, at 1153MST. No serious accidents or injuries were reported due to the flash flooding.

Flash Flood in MARICOPA, ARIZONA
From 09-AUG-16 11:30:00 to 09-AUG-16 14:00:00 (MST-7)
Location: ESTRELLA
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with locally heavy rain developed across portions of south central Arizona, including the greater Phoenix metropolitan area, during the late morning hours on August 9th. Peak rain rates with the stronger storms approached 2 inches per hour which led to episodes of street flooding and flash flooding across the central deserts. By the early afternoon, flash flooding had spread to areas southwest of the greater Phoenix area; at 1318MST the Arizona Department of Transportation indicated that flash flooding caused Highway 238 to become closed about 5 miles to the southwest of the town of Mobile. A Flash Flood Warning was not in effect for the area at the time of the flooding.

Flash Flood in PINAL, ARIZONA
From 09-AUG-16 11:30:00 to 09-AUG-16 14:00:00 (MST-7)
Location: APACHE JCT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with very heavy rain developed across Apache Junction during the late morning hours on August 9th and peak rain rates with the stronger storms approached 2 inches per hour. Locally heavy rain in the area led to flash flooding in Apache Junction; according to local law enforcement, at 1156MST Second Avenue between Idaho Road and Winchester Road was closed due to flash flooding. No significant accidents were reported as a result of the flooding however. A Flash Flood Warning was issued for Apache Junction beginning at 1153MST and it remained in effect through 1400MST.

Heavy Rain in PINAL, ARIZONA
From 09-AUG-16 11:00:00 to 09-AUG-16 14:00:00 (MST-7)
Location: APACHE JCT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with locally heavy rain developed across the far eastern portion of the greater Phoenix metropolitan area, including the community of Apache Junction, during the late morning hours on August 9th. A utility company report indicated that 1 mile east of Apache Junction, near the intersection of South Idaho Road and the Old West Highway, 1.89 inches of rain was measured in a one hour period ending at 1200MST. The heavy rain then led to episodes of street flooding in Apache Junction. At 1338MST a trained weather spotter 1 mile southwest of Apache Junction reported extensive street flooding at the intersection of Delaware and Broadway roads.