Scattered to numerous showers and thunderstorms developed across south central Arizona, including the greater Phoenix metropolitan area, during the early morning hours on August 11th. Some of the heavier rains began falling over the southeastern portion of the Phoenix area including communities such as Mesa, Chandler and Queen Creek as of 0400MST and required the issuance of Urban and Small Stream Flood Advisories. Rain continued into the morning hours and led to areal flooding of roads, streams and washes. Numerous roads became closed and extensive street flooding was observed. The Small Stream Flood Advisories were upgraded to Areal Flood Warnings; some of the most significant urban flooding occurred in the community of Mesa and the flooding persisted through the morning and into the early afternoon hours.

Heavy Rain in MARICOPA, ARIZONA
From 11-AUG-16 08:30:00 to 11-AUG-16 12:00:00 (MST-7)
Location: SCOTTSDALE MUNI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with heavy rain developed over much of the greater Phoenix metropolitan area, especially the eastern portion, during the morning hours on August 11th. Peak rain rates with the heavier showers were in excess of one inch per hour, and the rains eventually led to episodes of urban street flooding in communities such as Scottsdale and Mesa. At 0900MST a trained weather spotter 2 miles northeast of North Scottsdale reported curb to curb flooding at the intersection of Thompson Peak and Bell Roads as well as nearby areas. He also noted that area washes were running. At about 0900MST an Urban and Small Stream Flood Advisory was issued for the area and it remained in effect through 1200MST. Flash flooding was not reported in the area.

Flood in MARICOPA, ARIZONA
From 11-AUG-16 07:00:00 to 11-AUG-16 12:00:00 (MST-7)
Location: CHANDLER HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with heavy rain developed over much of the greater Phoenix metropolitan area during the early morning hours on August 11th, and some of the heavier rains occurred over the east and southeast portions including communities such as Chandler, Gilbert and Queen Creek. The heavy rains led to episodes of urban street flooding which led to the closure of various roads. Urban and Small Stream Advisories were issued starting as early as 0400MST and eventually were upgraded to Areal Flood Warnings. At 0740MST, local law enforcement reported that the Hunt Highway was closed between Gilbert Road and Lindsey Road due to areal flooding. The Areal Flood Warning for the area was issued at 0726MST and remained in effect through 1200MST.

Flood in MARICOPA, ARIZONA
From 11-AUG-16 08:30:00 to 11-AUG-16 13:45:00 (MST-7)
Location: BUCKHORN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorms with heavy rain started to develop during the early morning hours across the eastern portion of the greater Phoenix area, and the stronger storms produced locally heavy rainfall. Some of the heavier rains fell across the community of Mesa. The heavy rain led to widespread street flooding and then areal flooding of roads resulting in road closures. According to a broadcast media report, at 0845MST the intersection of Main Street and Val Vista Drive was completely inundated. This was about 4 miles west of East Mesa. An Areal Flood Warning was issued for the area at 0853MST and it remained in effect until 1335MST.