The active monsoon season continued into the second week of August, with thunderstorms causing more flash flooding, large hail, and strong winds. The monsoon moisture that had been over Utah for nearly 3 weeks finally moved off to the east on August 8th.

Thunderstorm Wind in BOX ELDER, UTAH
From 05-AUG-10 16:45:00 to 05-AUG-10 16:45:00 (MST-7)
Location: LAKESIDE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Lakeside Mountain Snownet sensor recorded a maximum wind gust of 62 mph.

Thunderstorm Wind in TOOELE, UTAH
From 05-AUG-10 18:05:00 to 05-AUG-10 18:05:00 (MST-7)
Location: (DPG)MICHAEL AAF DUG
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The White Sage sensor in the Dugway Proving Ground mesonet recorded a maximum wind gust of 68 mph.

Hail in DUCHESNE, UTAH
From 06-AUG-10 13:50:00 to 06-AUG-10 13:50:00 (MST-7)
Location: MYTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail covered the ground near Myton, with the hail stones generally measuring one inch in diameter.

Flash Flood in WASHINGTON, UTAH
From 05-AUG-10 15:15:00 to 05-AUG-10 16:15:00 (MST-7)
Location: BLOOMINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain at the headwaters of the Fort Pearce Wash, with an estimated total of over 3.5 inches of precipitation, caused flash flooding along the wash. The travel time to St. George was  over 6 hours. The Fort Pearce gauge rose from zero to 680 cfs. The golf course attendant at St. George indicated the flood was the greatest he had seen in 6 years.

Thunderstorm Wind in BOX ELDER, UTAH
From 06-AUG-10 15:20:00 to 06-AUG-10 15:20:00 (MST-7)
Location: CURLEW JCT
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Curlew Junction mesonet sensor recorded a maximum wind gust of 75 mph.

Flash Flood in KANE, UTAH
From 08-AUG-10 15:00:00 to 08-AUG-10 17:00:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A very large flash flood occurred in the Buckskin Gulch and the Paria River. The river gauge further downstream, at Lee's Ferry in Arizona, recorded a rise on the Paria from 25 cfs to 5620 cfs in less than two hours.

Flash Flood in KANE, UTAH
From 08-AUG-10 22:00:00 to 08-AUG-10 23:30:00 (MST-7)
Location: GLEN CANYON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Heavy rain caused flash flooding on Wahweap Creek.

Thunderstorm Wind in BOX ELDER, UTAH
From 06-AUG-10 16:00:00 to 06-AUG-10 16:00:00 (MST-7)
Location: KELTON
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Locomotive Springs sensor recorded a wind gust of 62 mph.

Thunderstorm Wind in BOX ELDER, UTAH
From 06-AUG-10 16:30:00 to 06-AUG-10 16:30:00 (MST-7)
Location: LAKESIDE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 60 mph was recorded at the Gunnison Island sensor.

Thunderstorm Wind in BOX ELDER, UTAH
From 06-AUG-10 17:00:00 to 06-AUG-10 17:00:00 (MST-7)
Location: SALINE
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Hat Island sensor recorded a maximum wind gust of 71 mph.