The deep monsoonal moisture that moved into Utah at the end of August remained in place for the beginning of September. This moist airmass produced widespread showers and thunderstorms, with several of them becoming severe or producing flash floods.

Flash Flood in WAYNE, UTAH
From 02-SEP-12 16:50:00 to 02-SEP-12 18:00:00 (MST-7)
Location: FRUITA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Park rangers at Capitol Reef National Park reported flash flooding along both Sulphur Creek and Sheets Gulch.

Hail in JUAB, UTAH
From 01-SEP-12 13:15:00 to 01-SEP-12 13:15:00 (MST-7)
Location: NEPHI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Penny to quarter sized hail was reported on Interstate 15 between mile markers 230 and 235.

Hail in MILLARD, UTAH
From 01-SEP-12 10:15:00 to 01-SEP-12 10:15:00 (MST-7)
Location: GARRISON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

One inch hail was reported near US-50, close to the Utah/Nevada border.

Hail in DAVIS, UTAH
From 01-SEP-12 16:51:00 to 01-SEP-12 16:51:00 (MST-7)
Location: FARMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch hail was reported in Farmington.

Flash Flood in MILLARD, UTAH
From 01-SEP-12 13:15:00 to 01-SEP-12 15:15:00 (MST-7)
Location: OAK CITY
Flood cause: Heavy Rain / Burn Area
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain over the Clay Springs burn scar caused a debris flow on the afternoon of September 1st. Four homes in the Fools Creek area experienced flooded basements, and one yard was severely damaged. In addition, a single wide trailer in the same area was pushed off its foundation. Six to eight inches of mud and debris crossed Highway 125, causing some damage along the edges of the roadway.

Flash Flood in UTAH, UTAH
From 01-SEP-12 19:00:00 to 01-SEP-12 21:00:00 (MST-7)
Location: LEHI
Flood cause: Heavy Rain / Burn Area
Property damage: 1.00M
Crop damage: 0.00K
Reported by: County Official

Heavy rain over the Dump Fire burn scar created a debris flow, flooding a portion of Saratoga Springs, and forcing the closure of Highway 68 for a period of time. Twenty residences experienced flood damage, with 11 of those homes having water in their basements, and 9 of those homes experiencing solely yard damage. Finished basements were completely destroyed in 5 separate homes, with the most impacted home having mud nine feet deep in the basement. Structural damage to homes was estimated at $250,000, and many personal possessions inside the homes were also damaged or destroyed. Public infrastructure was also impacted, with approximately $200,000 worth of damage to a nearby park and $50,000 of fencing destroyed.

Flash Flood in EMERY, UTAH
From 01-SEP-12 15:30:00 to 01-SEP-12 16:30:00 (MST-7)
Location: MOHRLAND
Flood cause: Heavy Rain / Burn Area
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain over the Seeley burn scar caused yet another debris flow in the area. The flooding originated from Pole and Engineer Canyons, and caused damage along State Route 31. Car-sized boulders were deposited on State Route 31 at the base of Pole Canyon.

Hail in TOOELE, UTAH
From 01-SEP-12 14:35:00 to 01-SEP-12 14:35:00 (MST-7)
Location: ARINOSA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Marble to quarter sized hail was reported along Interstate 80 near Milepost 20.

Thunderstorm Wind in TOOELE, UTAH
From 01-SEP-12 14:45:00 to 01-SEP-12 14:45:00 (MST-7)
Location: BARRO
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A maximum wind gust of 62 mph was reported at the Interstate 80 sensor.