Widespread thunderstorms developed over Utah on September 14, resulting in widespread flash flooding across southern Utah with some strong winds. Strong winds over Lake Powell resulted in three injuries to boaters. Additional showers and thunderstorms developed on September 15, resulting in additional areas of flooding in northern Utah and southern Utah.

Thunderstorm Wind in TOOELE, UTAH
From 14-SEP-17 00:05:00 to 14-SEP-17 00:05:00 (MST-7)
Location: BARRO
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Interstate 80 sensor recorded a peak wind gust of 60 mph.

Thunderstorm Wind in GARFIELD, UTAH
From 14-SEP-17 14:05:00 to 14-SEP-17 14:05:00 (MST-7)
Location: BOULDER
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Henry Mountain RAWS recorded a peak wind gust of 70 mph.

Thunderstorm Wind in KANE, UTAH
From 14-SEP-17 14:00:00 to 14-SEP-17 14:00:00 (MST-7)
Location: BULLFROG
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Bullfrog Marina automated weather station reported a peak wind gust of 73 mph.

Flash Flood in WASHINGTON, UTAH
From 14-SEP-17 16:00:00 to 14-SEP-17 18:00:00 (MST-7)
Location: ZION NATIONAL PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding was reported in multiple slot canyons in Zion National Park.

Flash Flood in WAYNE, UTAH
From 14-SEP-17 16:00:00 to 14-SEP-17 18:00:00 (MST-7)
Location: FREMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Widespread flash flooding was reported across Capitol Reef National Park.

Flash Flood in KANE, UTAH
From 14-SEP-17 16:00:00 to 14-SEP-17 18:00:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A large flash flood was reported in Buckskin Wash and some surrounding drainages.

Flash Flood in KANE, UTAH
From 14-SEP-17 17:00:00 to 14-SEP-17 19:00:00 (MST-7)
Location: ADAIRVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A flash flood was reported in Buckskin Wash.

Thunderstorm Wind in TOOELE, UTAH
From 14-SEP-17 00:00:00 to 14-SEP-17 00:00:00 (MST-7)
Location: BARRO
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The I-80 @ mp 29 sensor recorded a peak wind gust of 60 mph.

Thunderstorm Wind in KANE, UTAH
From 14-SEP-17 12:50:00 to 14-SEP-17 12:50:00 (MST-7)
Location: GLEN CANYON
Magnitude: 61.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms moving over the Glen Canyon National Recreation Area produced severe microburst winds in the Padre Canyon, Sand King, Lone Rock, and Gunsight areas of the park. Several boats were overturned, including a 75 foot houseboat carrying 14 people. Aboard the large houseboat in Padre Canyon, the arm of an 80-year-old woman was severed, and a 57-year-old woman suffered head and hip injuries. Another person near Gunsight suffered a dislocated shoulder.

Flash Flood in GARFIELD, UTAH
From 14-SEP-17 16:00:00 to 14-SEP-17 18:00:00 (MST-7)
Location: ESCALANTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding was reported across many tributaries of the Escalante River.

Flood in SALT LAKE, UTAH
From 15-SEP-17 08:00:00 to 15-SEP-17 10:00:00 (MST-7)
Location: SALT LAKE CITY
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain caused flood damage to the Salt Lake City Justice Court and to a nearby Crossfit gym.

Flash Flood in WAYNE, UTAH
From 15-SEP-17 16:30:00 to 15-SEP-17 18:30:00 (MST-7)
Location: NOTOM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Flash flooding was reported on Pleasant Creek in Capitol Reef National Park.