The moist airmass that was in place at the end of July, remained in place into August, with widespread afternoon thunderstorms across Utah. While flash flooding and severe thunderstorms were reported in both northern and southern Utah, the flooding primarily occurred across the southern half of the State, whereas large hail and gusty winds were more common in northern Utah, where there was a better shear environment.

Flash Flood in UTAH, UTAH
From 01-AUG-10 19:50:00 to 01-AUG-10 20:50:00 (MST-7)
Location: BIRDSEYE
Flood cause: Heavy Rain / Burn Area
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain over the Lake Fork burn scar caused a flash flood and debris flow, with Highway 89 being covered in water, mud, and rocks near Birdseye. The flood closed the highway in both directions between mile markers 305 and 307, and some cars were stuck in the debris.

Flash Flood in WAYNE, UTAH
From 02-AUG-10 15:37:00 to 02-AUG-10 17:37:00 (MST-7)
Location: FRUITA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Heavy rain caused flash flooding along the Scenic Drive of Capitol Reef National Park, including the Fremont River, Sulphur Creek, the Grand Wash, and Capitol Gorge. People stranded in the Grand Wash had to be rescued.

Flash Flood in KANE, UTAH
From 02-AUG-10 15:32:00 to 02-AUG-10 17:32:00 (MST-7)
Location: ALTON
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Heavy rain caused flash flooding near the Skutumpah Road, damaging the road. As a result, rangers were cut off from traveling throughout the Grand Staircase Escalante National Monument.

Flash Flood in WAYNE, UTAH
From 03-AUG-10 14:10:00 to 03-AUG-10 15:40:00 (MST-7)
Location: CAINEVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding occurred at the headwaters of several creeks at the north end of Capitol Reef National Park, with the Fremont River gauge at Caineville rising from 58 cfs to 700 cfs in one hour.

Flash Flood in KANE, UTAH
From 03-AUG-10 16:55:00 to 03-AUG-10 18:55:00 (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 House Rock Valley Road, as well as in Buckskin Gulch, in which water rose to 5 feet high.

Flash Flood in KANE, UTAH
From 03-AUG-10 12:15:00 to 03-AUG-10 18:15:00 (MST-7)
Location: PARIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain caused the Paria River to increase from 20 cfs to 4000 cfs. Travel time on the flood was a little more than 6 hours, with the majority of the rain falling just southeast of Bryce Canyon National Park.

Hail in UTAH, UTAH
From 04-AUG-10 14:05:00 to 04-AUG-10 14:05:00 (MST-7)
Location: AMERICAN FORK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail stones ranging in size from 0.75 inches to 1 inch in diameter were reported near Highland.

Hail in SALT LAKE, UTAH
From 04-AUG-10 13:45:00 to 04-AUG-10 13:45:00 (MST-7)
Location: RIVERTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail estimated to be 0.75 inches in diameter was reported near Riverton.

Hail in UTAH, UTAH
From 04-AUG-10 18:05:00 to 04-AUG-10 18:05:00 (MST-7)
Location: PLEASANT GROVE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail with a diameter of 0.75 inches was reported in Pleasant Grove.

Flash Flood in WAYNE, UTAH
From 03-AUG-10 15:30:00 to 03-AUG-10 17:30:00 (MST-7)
Location: LOA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A slow moving thunderstorm produced very heavy rain, and caused flash flooding along SR-24 between Loa and Koosharem. There were several accidents on the highway as the storm was overhead. Note that this storm also produced severe hail.

Hail in WAYNE, UTAH
From 03-AUG-10 15:20:00 to 03-AUG-10 15:20:00 (MST-7)
Location: LOA
Magnitude: 1.00 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Hail, that was estimated to be one inch in diameter, pitted cars traveling along SR-24 near Loa. This storm was slow moving, and 5 inches of hail accumulated in the same area. Several accidents were reported on the highway as the storm was overhead. Note that this storm also caused flash flooding in the area.

Flash Flood in SEVIER, UTAH
From 03-AUG-10 17:35:00 to 03-AUG-10 19:35:00 (MST-7)
Location: KOOSHAREM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain north of Koosharem caused a mudslide that blocked SR-62 near milepost 40. All lanes along the highway were closed until the slide could be cleaned up.

Flash Flood in WAYNE, UTAH
From 04-AUG-10 12:40:00 to 04-AUG-10 14:10:00 (MST-7)
Location: FREMONT
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding occurred in the Cathedral District on the north end of Capitol Reef National Park. The heavy rain made roads impassable and virtually destroyed them, leaving much of the area impassable until county road crews were able to rebuild the roads.

Flash Flood in EMERY, UTAH
From 04-AUG-10 13:45:00 to 04-AUG-10 15:45:00 (MST-7)
Location: MOUNDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Price River gauge rose from 50 cfs to 480 cfs. Widespread rainfall amounts of more than 2 inches in 3 hours were observed in the area.

Flash Flood in EMERY, UTAH
From 04-AUG-10 17:45:00 to 04-AUG-10 18:45:00 (MST-7)
Location: SPHINX SIDING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

State park rangers reported that heavy rains washed out roads in multiple locations north of Goblin Valley State Park.

Hail in BEAVER, UTAH
From 03-AUG-10 20:30:00 to 03-AUG-10 20:30:00 (MST-7)
Location: BEAVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail measured to be one inch in diameter was reported in Beaver.

Hail in SALT LAKE, UTAH
From 04-AUG-10 13:55:00 to 04-AUG-10 13:55:00 (MST-7)
Location: SANDY CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny-sized hail, or hail of approximately 0.75 inches in diameter, was reported near Sandy.

Flash Flood in GARFIELD, UTAH
From 03-AUG-10 14:00:00 to 03-AUG-10 15:00:00 (MST-7)
Location: ESCALANTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Heavy rain caused flash flooding in Alvey Wash, North Creek, and many other washes in the area.