A negatively tilted trough moved through eastern Utah on the morning and afternoon of Saturday, June 6th, causing a widespread severe weather event that would become the first derecho to impact the Great Basin in well over a decade. Severe storms produced large hail up to golf ball size in southeast Utah. Wind gusts upwards of 60 to 80 mph were reported on average with some gusts topping 80 to 100 mph in some areas due to strong downburst winds. There were multiple reports of uprooted trees, downed power lines, and several houses/cabins and vehicles were damaged by falling trees and/or large hail. Very heavy rain also fell which led to flash flooding in some areas.

Hail in UINTAH, UTAH
From 06-JUN-20 10:45:00 to 06-JUN-20 10:55:00 (MST-7)
Location: DRAGON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A severe thunderstorm produced large hail estimated to be the size of quarters on the Seep Ridge Wildfire.

Thunderstorm Wind in UINTAH, UTAH
From 06-JUN-20 12:27:00 to 06-JUN-20 12:37:00 (MST-7)
Location: JENSEN
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A peak wind gust of 74 mph was measured by the Diamond Rim automated weather station.

Thunderstorm Wind in DAGGETT, UTAH
From 06-JUN-20 12:26:00 to 06-JUN-20 12:36:00 (MST-7)
Location: DUTCH JOHN
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A peak wind gust of 77 mph was measured by the Kings Point automated weather station.

Flash Flood in SAN JUAN, UTAH
From 06-JUN-20 08:50:00 to 06-JUN-20 09:00:00 (MST-7)
Location: MEXICAN HAT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy rain from thunderstorms allowed normally dry arroyos to fill rapidly which resulted in a flash flood. The Cooperative Observer at the Valley of the Gods north of Mexican Hat measured 0.58 inches of rain at the end of the event.

Hail in SAN JUAN, UTAH
From 06-JUN-20 09:30:00 to 06-JUN-20 09:40:00 (MST-7)
Location: MONTICELLO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm produced large hail estimated to be the size of golf balls in Monticello.

Hail in SAN JUAN, UTAH
From 06-JUN-20 08:55:00 to 06-JUN-20 09:05:00 (MST-7)
Location: BLANDING
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

A severe thunderstorm produced large hail estimated to be the size of half dollars west-northwest of Blanding.

Hail in SAN JUAN, UTAH
From 06-JUN-20 09:10:00 to 06-JUN-20 09:20:00 (MST-7)
Location: BLANDING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A severe thunderstorm produced large hail measured to be the size of golf balls in Blanding.

Hail in SAN JUAN, UTAH
From 06-JUN-20 08:40:00 to 06-JUN-20 08:50:00 (MST-7)
Location: MEXICAN HAT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A severe thunderstorm produced large hail measured to be the size of quarters at the Valley of the Gods north of Mexican Hat.

Hail in SAN JUAN, UTAH
From 06-JUN-20 08:55:00 to 06-JUN-20 09:05:00 (MST-7)
Location: BLUFF
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A severe thunderstorm produced large hail measured to be the size of ping-pong balls in Bluff.

Thunderstorm Wind in SAN JUAN, UTAH
From 06-JUN-20 09:27:00 to 06-JUN-20 09:37:00 (MST-7)
Location: BLANDING
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Blanding Cooperative Observer estimated a peak wind gust of 75 mph.

Hail in SAN JUAN, UTAH
From 06-JUN-20 09:42:00 to 06-JUN-20 09:52:00 (MST-7)
Location: MONTICELLO
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm produced large hail measured to be the size of half dollars in Monticello.

Thunderstorm Wind in UINTAH, UTAH
From 06-JUN-20 11:27:00 to 06-JUN-20 11:37:00 (MST-7)
Location: DRAGON
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A peak wind gust of 72 mph was measured by the McCook Ridge automated weather station.

Thunderstorm Wind in UINTAH, UTAH
From 06-JUN-20 11:27:00 to 06-JUN-20 11:37:00 (MST-7)
Location: DRAGON
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A peak wind gust of 68 mph was measured by the P.R. Canyon automated weather station.

Thunderstorm Wind in UINTAH, UTAH
From 06-JUN-20 11:48:00 to 06-JUN-20 11:58:00 (MST-7)
Location: OURAY
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A peak wind gust of 66 mph was measured by the Wildhorse automated weather station.