Severe thunderstorms began across the western half of the Billings Forecast Area during the afternoon of the 10th. A few of these thunderstorms continued into the early evening hours. An inverted trough and strong jet stream moved over the area during this time. In addition, a strong cold front moved across the entire forecast area during the late afternoon hours through the late evening hours. All of these factors led to a few severe thunderstorms producing large hail and damaging winds. The largest hail reported was 2.5 in diameter with the strongest thunderstorm winds being 75 mph.
A different scenario developed behind the front across the Beartooth/Absaroka and Red Lodge Foothills. Very strong winds aloft mixed down to the surface as 50 to 75 mph winds continued for several hours behind the front. These winds resulted in additional damage. Locally higher winds estimated at 80 mph occurred just above and to the south of the city of Red Lodge.

High Wind in NORTHERN ROSEBUD, MONTANA
From 10-JUN-21 16:23:00 to 10-JUN-21 16:23:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A wind gust of 59 mph was recorded 1 mile west of Ingomar.

High Wind in NORTHERN SWEET GRASS, MONTANA
From 10-JUN-21 16:30:00 to 10-JUN-21 16:30:00 (MST-7)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

A wind gust of 67 mph was recorded 2 miles southwest of Big Timber.

High Wind in RED LODGE FOOTHILLS, MONTANA
From 10-JUN-21 16:50:00 to 10-JUN-21 16:50:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A wind gust of 60 mph was recorded 1 mile south of Roscoe.

High Wind in NORTHERN BIG HORN, MONTANA
From 10-JUN-21 16:59:00 to 10-JUN-21 16:59:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 60 mph was recorded 3 miles southeast of Crow Agency.

High Wind in BEARTOOTH FOOTHILLS, MONTANA
From 10-JUN-21 17:00:00 to 10-JUN-21 17:00:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 64 mph was recorded 9 miles northwest of Absarokee.

High Wind in CRAZY MOUNTAINS, MONTANA
From 10-JUN-21 17:12:00 to 10-JUN-21 17:12:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 64 mph was recorded 17 miles northeast of Wilsall.

High Wind in NORTHERN ROSEBUD, MONTANA
From 10-JUN-21 17:20:00 to 10-JUN-21 17:20:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A wind gust of 65 mph was recorded 1 mile northwest of Ingomar.

High Wind in BEARTOOTH FOOTHILLS, MONTANA
From 10-JUN-21 17:45:00 to 10-JUN-21 17:45:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 59 mph was recorded 7 miles south of Reed Point.

High Wind in NORTHERN ROSEBUD, MONTANA
From 10-JUN-21 17:59:00 to 10-JUN-21 17:59:00 (MST-7)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 61 mph was recorded 2 miles northwest of Forsyth.

High Wind in BEARTOOTH FOOTHILLS, MONTANA
From 10-JUN-21 18:22:00 to 10-JUN-21 18:22:00 (MST-7)
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Winds gusted to 70 mph 3 miles west of Fishtail.

High Wind in CUSTER, MONTANA
From 10-JUN-21 18:28:00 to 10-JUN-21 18:28:00 (MST-7)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds gusted to 58 mph 10 miles east of Miles City.

High Wind in ABSAROKA / BEARTOOTH MOUNTAINS, MONTANA
From 10-JUN-21 18:35:00 to 10-JUN-21 18:35:00 (MST-7)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Winds gusted to 72 mph 13 miles southwest of Greycliff.

High Wind in RED LODGE FOOTHILLS, MONTANA
From 10-JUN-21 18:40:00 to 10-JUN-21 18:40:00 (MST-7)
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Very strong winds at mountain top level mixed down to the surface for several hours. These winds were estimated at 80 mph which resulted in damage just above and south of the city of Red Lodge. Most of the damage occurred around 400 Ranch, south of Red Lodge. Damage included numerous powerlines down along with an estimated couple hundred trees blown down and uprooted. In addition, downed trees caused damage to one vehicle.

Hail in MUSSELSHELL, MONTANA
From 10-JUN-21 14:41:00 to 10-JUN-21 14:41:00 (MST-7)
Location: KLEIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in MUSSELSHELL, MONTANA
From 10-JUN-21 14:49:00 to 10-JUN-21 14:49:00 (MST-7)
Location: KLEIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 14:50:00 to 10-JUN-21 14:50:00 (MST-7)
Location: SHEPHERD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MUSSELSHELL, MONTANA
From 10-JUN-21 15:15:00 to 10-JUN-21 15:15:00 (MST-7)
Location: KLEIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STILLWATER, MONTANA
From 10-JUN-21 15:27:00 to 10-JUN-21 15:27:00 (MST-7)
Location: PARK CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 16:09:00 to 10-JUN-21 16:09:00 (MST-7)
Location: BILLINGS HGTS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 16:10:00 to 10-JUN-21 16:10:00 (MST-7)
Location: SHEPHERD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 16:15:00 to 10-JUN-21 16:15:00 (MST-7)
Location: SHEPHERD
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail size was mostly dimes but a few were hen egg size.

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 15:57:00 to 10-JUN-21 15:57:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 16:55:00 to 10-JUN-21 16:55:00 (MST-7)
Location: LAUREL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 17:00:00 to 10-JUN-21 17:00:00 (MST-7)
Location: LAUREL MUNI ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 17:12:00 to 10-JUN-21 17:12:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 10-JUN-21 17:11:00 to 10-JUN-21 17:11:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 10-JUN-21 18:30:00 to 10-JUN-21 18:30:00 (MST-7)
Location: ROCK SPGS
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROSEBUD, MONTANA
From 10-JUN-21 18:38:00 to 10-JUN-21 18:38:00 (MST-7)
Location: ROCK SPGS
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

High Wind in LIVINGSTON AREA, MONTANA
From 10-JUN-21 14:15:00 to 10-JUN-21 14:15:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds gusted to 59 mph just west of Livingston.

High Wind in LIVINGSTON AREA, MONTANA
From 10-JUN-21 14:44:00 to 10-JUN-21 14:44:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winds gusted to 63 mph at the Livingston Airport.

High Wind in LIVINGSTON AREA, MONTANA
From 10-JUN-21 14:58:00 to 10-JUN-21 14:58:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds gusted to 60 mph just east of Livingston.

High Wind in LIVINGSTON AREA, MONTANA
From 10-JUN-21 14:59:00 to 10-JUN-21 14:59:00 (MST-7)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winds gusted to 67 mph at the Livingston Airport.

High Wind in BEARTOOTH FOOTHILLS, MONTANA
From 10-JUN-21 15:35:00 to 10-JUN-21 15:35:00 (MST-7)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 62 mph was recorded 13 miles southwest of Greycliff.

High Wind in NORTHERN SWEET GRASS, MONTANA
From 10-JUN-21 16:00:00 to 10-JUN-21 16:00:00 (MST-7)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 61 mph was recorded 9 miles southeast of Melville.

High Wind in NORTHERN SWEET GRASS, MONTANA
From 10-JUN-21 16:15:00 to 10-JUN-21 16:15:00 (MST-7)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 58 mph was recorded 9 miles southeast of Big Timber.