Afternoon thunderstorms continued across Utah in the middle of August. The strongest of these thunderstorms most commonly produced flash flooding in southern Utah, but isolated occurrences of severe winds and a tornado were also observed.

Thunderstorm Wind in BEAVER, UTAH
From 16-AUG-12 18:29:00 to 16-AUG-12 18:35:00 (MST-7)
Location: (MLF)MILFORD MUNI AR
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Milford ASOS recorded a peak wind gust of 60 mph.

Tornado in BEAVER, UTAH
From 21-AUG-12 13:11:00 to 21-AUG-12 13:13:00 (MST-7)
Location: NEWHOUSE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Beaver County Sheriff reported a tornado along the Utah/Nevada border.

Flash Flood in IRON, UTAH
From 17-AUG-12 17:15:00 to 17-AUG-12 18:15:00 (MST-7)
Location: CEDAR CITY
Flood cause: Heavy Rain
Property damage: 1.50M
Crop damage: 0.00K
Reported by: County Official

Major flash flooding occurred in the cities of Enoch and Cedar City on the afternoon of August 17th. Enoch had the most significant damage, with 110 houses damaged by flood waters, while Cedar City mostly experienced street flooding. About 30 of those 110 houses experienced major damage, typically over $30,000 per house, while the rest had more minor damage. Flood waters and some sewage poured into many basements, as well as some ground level floors. The water broke windows and destroyed carpets, walls, and personal belongings in many of the homes.

Flash Flood in KANE, UTAH
From 19-AUG-12 22:30:00 to 19-AUG-12 23:30:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash flooding occurred once again along the Paria River, with the river gauge readings peaking at 2625 cfs.

Flash Flood in WASHINGTON, UTAH
From 19-AUG-12 18:00:00 to 19-AUG-12 19:00:00 (MST-7)
Location: TOQUERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Multiple drainages southeast of the Pine Valley Mountains experienced flash flooding.

Flash Flood in WASHINGTON, UTAH
From 19-AUG-12 17:15:00 to 19-AUG-12 18:15:00 (MST-7)
Location: ZION LODGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding was reported along the North Fork of the Virgin River and in the Narrows. The river gauge at the North Fork of the Virgin went from 53 to 1054 cfs in one hour.

Flash Flood in GARFIELD, UTAH
From 19-AUG-12 16:50:00 to 19-AUG-12 17:50:00 (MST-7)
Location: ESCALANTE MUNI ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

A large flash flood occurred in the area around 25 Mile Wash, damaging roads in the area.

Flash Flood in WASHINGTON, UTAH
From 19-AUG-12 17:40:00 to 19-AUG-12 22:40:00 (MST-7)
Location: VIRGIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

A large flash flood occurred in the Subway portion of Zion National Park, as well as a few other surrounding drainages. Due to this flood, 22 people in 6 different groups were stranded in the Subway overnight. Two additional people were stranded overnight in Behunin Canyon.

Flash Flood in WASHINGTON, UTAH
From 17-AUG-12 18:45:00 to 17-AUG-12 19:45:00 (MST-7)
Location: ZION LODGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

After an estimated 1.25 inches of rain fell over Zion National Park, flash flooding was reported in Spry Canyon, Pine Creek Canyon, and Echo Canyon. The heavy rainfall also caused rocks to fall onto State Route 9, between the switchbacks and the tunnel, which impacted traffic through the park.

Flash Flood in WASHINGTON, UTAH
From 17-AUG-12 20:00:00 to 17-AUG-12 21:00:00 (MST-7)
Location: ROCKVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Estimated rainfall amounts of 1.5 to 2 inches fell over southern Washington County, causing flash flooding around parts of Hildale.

Flash Flood in KANE, UTAH
From 19-AUG-12 15:40:00 to 19-AUG-12 16:40:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A large flash flood along the Paria River was observed as it passed under State Route 89. The spotter estimated that the first 200 to 300 yards of the flood was composed of debris, including trees and logs. The gauge along the river increased to 8200 cfs.