After a brief break from showers and thunderstorms, significant moisture and instability returned to Utah, with flash flooding, large hail, and even a tornado reported across the state.

Thunderstorm Wind in MILLARD, UTAH
From 06-SEP-13 13:37:00 to 06-SEP-13 13:37:00 (MST-7)
Location: COVE FT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Horse Hollow RAWS recorded a peak wind gust of 65 mph.

Thunderstorm Wind in BOX ELDER, UTAH
From 06-SEP-13 15:45:00 to 06-SEP-13 15:45:00 (MST-7)
Location: SALINE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Hat Island sensor recorded a 60 mph wind gust.

Thunderstorm Wind in TOOELE, UTAH
From 06-SEP-13 15:45:00 to 06-SEP-13 15:45:00 (MST-7)
Location: (DPG)MICHAEL AAF DUG
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 65 mph wind gust was recorded at the Simpson Springs sensor in the Dugway Proving Ground mesonet.

Thunderstorm Wind in DAVIS, UTAH
From 06-SEP-13 17:00:00 to 06-SEP-13 17:00:00 (MST-7)
Location: SYRACUSE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A sensor in Syracuse, Utah recorded a wind gust of 60 mph.

Flash Flood in GARFIELD, UTAH
From 09-SEP-13 15:45:00 to 09-SEP-13 16:45:00 (MST-7)
Location: ESCALANTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Escalante River gauge near Escalante rose from near zero cfs to 2200 cfs in one hour.

Flash Flood in GARFIELD, UTAH
From 09-SEP-13 15:30:00 to 09-SEP-13 17:00:00 (MST-7)
Location: BOULDER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding was reported across the Notom Road and much of the southern half of Capitol Reef National Park.

Flash Flood in KANE, UTAH
From 09-SEP-13 16:00:00 to 09-SEP-13 18:00:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding was reported along Buckskin Gulch, as well as many other small streams and dry washes in the lower Paria drainage.

Flash Flood in KANE, UTAH
From 09-SEP-13 16:53:00 to 09-SEP-13 17:53:00 (MST-7)
Location: GLEN CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash flooding occurred in the town of Big Water following heavy rainfall.

Flash Flood in KANE, UTAH
From 08-SEP-13 13:00:00 to 08-SEP-13 17:00:00 (MST-7)
Location: GLEN CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large flash flood was reported on Wahweap Creek and the Paria River, as well as smaller drainages in the area.

Debris Flow in UTAH, UTAH
From 07-SEP-13 15:32:00 to 07-SEP-13 16:32:00 (MST-7)
Location: LEHI
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A debris flow was reported off of the Dump Fire burn scar, but prior mitigation was successful, as retention ponds filled up, but debris did not flow into the towns of Eagle Mountain or Saratoga Springs.

Thunderstorm Wind in UTAH, UTAH
From 07-SEP-13 15:10:00 to 07-SEP-13 15:30:00 (MST-7)
Location: PROVO ARPT
Magnitude: 51.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm winds developed in Provo, with the Provo airport AWOS recording a peak wind gust of 59 mph. The most significant wind damage was a roof that was torn off of an apartment building. In addition, some smaller trees were knocked down, and hundreds of tree branches were downed.

Tornado in UTAH, UTAH
From 07-SEP-13 15:40:00 to 07-SEP-13 15:45:00 (MST-7)
Location: AMERICAN FORK
Tornado F-scale: EF0
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A small tornado was spotted and recorded by a member of the public. The tornado removed a metal roof from a barn, and did minor damage to trees and other outbuildings in the area.

Flash Flood in KANE, UTAH
From 09-SEP-13 14:19:00 to 09-SEP-13 16:19:00 (MST-7)
Location: GLEN CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A very large flash flood was reported in Wahweap Creek, Buckskin Gulch, and many other drainages in the area.

Flash Flood in WASHINGTON, UTAH
From 08-SEP-13 11:00:00 to 08-SEP-13 12:00:00 (MST-7)
Location: ZION NATIONAL PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Some smaller slot canyons in the northern portions of Zion National Park experienced flash flooding, and the North Fork Virgin River Near Springdale gauge went from near zero cfs to 415 cfs.

Flash Flood in WASHINGTON, UTAH
From 09-SEP-13 14:47:00 to 09-SEP-13 18:00:00 (MST-7)
Location: ZION LODGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding and large waterfalls were reported throughout much of Zion National Park. In addition, the East Fork Virgin River Near Springdale, UT gauge rose from 34 cfs to 1400 cfs in one hour.

Flash Flood in UTAH, UTAH
From 07-SEP-13 15:10:00 to 07-SEP-13 17:10:00 (MST-7)
Location: GOSHEN
Flood cause: Heavy Rain
Property damage: 900.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused flash flooding across much of urban Utah County, with multiple locations recording 0.6-0.8 inches of rain in only 15 minutes. The most significant damage from flooding was reported in Provo, Orem, Payson, and Santaquin. Street flooding was widespread and some roads incurred major damage, with the worst damage occurring at 900 North and Grand Avenue in Provo, where water undercut and washed out a large portion of the asphalt road. Debris from the storm was scattered across most local roadways, taking several days to clean up, and even closed some roads for a period of time. Flowing water caused also caused significant damage to large concrete stairs at Lions Park in Provo. At University Mall in Orem, water quickly filled the parking lot, submerging many cars in more than a foot of water.
Residential areas also received significant flood damage. In Provo, at least 25 homes had major damage, with more than 50 receiving minor damage. In Orem, approximately 30 homes received flood damage. In Santaquin, about 30 homes had flooding a foot deep or more, while about 30 other homes had flooding with less than a foot of water. Water wasn't the only problem in Santaquin, as the storm drainage system became overwhelmed, and raw sewage flowed into many homes.
Finally, the flooding also impacted Timpanogos Cave National Monument, where heavy rain and associated debris stranded 150 hikers for several hours, before rangers were able to clear a path and rescue them. The Monument was closed for two full days while debris was cleaned up from both the hiking trails and nearby State Route 92.

Debris Flow in UTAH, UTAH
From 07-SEP-13 16:12:00 to 07-SEP-13 17:12:00 (MST-7)
Location: ALPINE
Flood cause: Heavy Rain / Burn Area
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain over the Quail Hollow Fire burn scar caused a significant debris flow, with water and mud flowing down into the town of Alpine. About 100 residents were evacuated from their homes due to the imminent flooding. Roads across the area were inundated with mud, and 15 homes were damaged by the water and debris.