A near stationary low pressure surface trough, warm moist air from the southeast and a strong cold front from the west all combined to allowed many severe thunderstorms to develop and strengthen through the afternoon and evening hours. Later that evening and night, larger-scale post-frontal non-thunderstorm high winds brought additional damage.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-JUN-21 22:10:00 to 10-JUN-21 22:10:00 (MST-7)
Location: RESERVE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported their outdoor propane tank was moved by severe thunderstorm wind gusts.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-JUN-21 15:45:00 to 10-JUN-21 15:45:00 (MST-7)
Location: DAGMAR
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported thunderstorm wind damage, via Facebook: A pivot was blown over; a grain bin was blown half a mile into a hay field; an outbuilding was destroyed; and the roof of another outbuilding was blown completely off.

Hail in VALLEY, MONTANA
From 10-JUN-21 19:01:00 to 10-JUN-21 19:01:00 (MST-7)
Location: LUSTRE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, hail up to the size of quarters.  Time estimated from radar.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:14:00 to 10-JUN-21 20:14:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Brorson NDAWN mesonet site, 7 NW Sidney, measured a 74 mph thunderstorm wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:16:00 to 10-JUN-21 20:16:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 78.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Brorson NDAWN mesonet site, 7 NW Sidney, measured a 90 mph thunderstorm wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 21:01:00 to 10-JUN-21 21:01:00 (MST-7)
Location: FAIRVIEW
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported hurricane force thunderstorm wind gusts.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 21:03:00 to 10-JUN-21 21:03:00 (MST-7)
Location: ND STATELINE HWY 2 DOT
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The US-2 @Stateline DOT site (MTSTA), recorded a 78 mph thunderstorm wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:24:00 to 10-JUN-21 20:24:00 (MST-7)
Location: SIDNEY
Magnitude: 64.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser estimated hurricane force thunderstorm wind gusts.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 21:18:00 to 10-JUN-21 21:18:00 (MST-7)
Location: ND STATELINE HWY 2 DOT
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The US-2 @Stateline DOT site (MTSTA), recorded an 80 mph thunderstorm wind gust.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-JUN-21 21:58:00 to 10-JUN-21 21:58:00 (MST-7)
Location: MEDICINE LAKE RAWS
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Medicine Lake RAWS site (MLKM8) recorded a 65 mph thunderstorm wind gust.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-JUN-21 22:10:00 to 10-JUN-21 22:10:00 (MST-7)
Location: RESERVE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated 80 mph thunderstorm wind gusts.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: RICHEY
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated thunderstorm wind gusts around 75 mph.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: RICHEY
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported windows blown out from thunderstorm wind gusts.

Hail in DAWSON, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: RICHEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated quarter size hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:10:00 to 10-JUN-21 20:10:00 (MST-7)
Location: LAMBERT
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet site near Lambert (DW8633) measured a 70 mph thunderstorm wind gust.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 19:37:00 to 10-JUN-21 19:37:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Trained spotter reported thunderstorm wind gust damage via Facebook: House soffit three feet in length was torn of a house; a dead tree was blown over; and live tree branches were downed.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:42:00 to 10-JUN-21 19:42:00 (MST-7)
Location: LINDSAY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, hail up to the size of half dollars, along with strong winds.

Heavy Rain in VALLEY, MONTANA
From 10-JUN-21 19:01:00 to 10-JUN-21 19:01:00 (MST-7)
Location: LUSTRE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, four inches of storm total rainfall.  Time estimated from rainfall.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 15:45:00 to 10-JUN-21 15:45:00 (MST-7)
Location: FAIRVIEW
Magnitude: 74.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Richland County DES Coordinator conducted a storm survey the morning after the storm and provided multiple reports and photos of straight-line wind damage in the town of Fairview with all debris lying in the same direction.  Large spruce and cottonwood trees were uprooted; a metal building was caved in; and large tree branches were downed.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 19:42:00 to 10-JUN-21 19:42:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported thunderstorm wind gust damage via Facebook: Windows were broken; crops and gardens were damaged; and pine trees were toppled.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:20:00 to 10-JUN-21 19:20:00 (MST-7)
Location: LINDSAY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, baseball size hail in the town of Lindsay.

Thunderstorm Wind in MCCONE, MONTANA
From 10-JUN-21 19:31:00 to 10-JUN-21 19:31:00 (MST-7)
Location: CIRCLE
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, an estimated 90 mph thunderstorm wind gust.  Time estimated from radar.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:37:00 to 10-JUN-21 19:37:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Trained spotter reported, via Facebook, hail up to the size of golf balls.  Time estimated by radar.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 20:30:00 to 10-JUN-21 20:30:00 (MST-7)
Location: BAINVILLE
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, multiple cases of thunderstorm wind damage: A stock trailer was rolled into a creek bottom; some shingles were blown off a roof; a barn wall was damaged; and a quonset door was lost.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 21:00:00 to 10-JUN-21 21:00:00 (MST-7)
Location: ND STATELINE HWY 2 DOT
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, a single-wide trailer home was flipped over and destroyed. Time and location are estimated.

Hail in PRAIRIE, MONTANA
From 10-JUN-21 19:00:00 to 10-JUN-21 19:00:00 (MST-7)
Location: MC CLOUD
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, hail up to the size of baseballs.  Time is estimated.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:16:00 to 10-JUN-21 20:16:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 100.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Nearly a mile of power line poles were snapped either a third to half way up off the ground between county roads 130 and 129. A newer metal building in the area sustained roof damage on its southwest portion, which was blown away to the northeast. A mesonet station within three miles of this location measured a wind gust of 90 mph.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: LAMBERT
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous power line poles were snapped at their bases, from County Road 201 southward on County Road 328 for a distance of up to 6 miles.  Only a few poles were snapped about a third of the way up.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:05:00 to 10-JUN-21 20:05:00 (MST-7)
Location: LAMBERT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several newer and well-built homes in the town of Lambert were damaged, including siding stripped from the southwest corners.

Hail in RICHLAND, MONTANA
From 10-JUN-21 20:05:00 to 10-JUN-21 20:05:00 (MST-7)
Location: LAMBERT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several newer and well-built homes in the town of Lambert were damaged, including siding stripped from the southwest corners.  Hail stones at least the size of quarters were assumed.

Heavy Rain in ROOSEVELT, MONTANA
From 10-JUN-21 20:30:00 to 10-JUN-21 20:30:00 (MST-7)
Location: BAINVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, 2.5 inches of rain.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 20:30:00 to 10-JUN-21 20:30:00 (MST-7)
Location: BAINVILLE
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, a measured thunderstorm wind gust of 67 mph.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-JUN-21 14:40:00 to 10-JUN-21 14:40:00 (MST-7)
Location: BREDETTE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported grain bins rolled, outbuildings damaged, and power poles knocked down.

Hail in SHERIDAN, MONTANA
From 10-JUN-21 15:00:00 to 10-JUN-21 15:00:00 (MST-7)
Location: OUTLOOK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of quarters.

Hail in SHERIDAN, MONTANA
From 10-JUN-21 15:00:00 to 10-JUN-21 15:15:00 (MST-7)
Location: RESERVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, hail up to the size of quarters.

Hail in RICHLAND, MONTANA
From 10-JUN-21 15:22:00 to 10-JUN-21 15:22:00 (MST-7)
Location: SIDNEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Richland County DES Coordinator reported hail up to the size of ping pong balls.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:15:00 to 10-JUN-21 19:15:00 (MST-7)
Location: LINDSAY DIVIDE DOT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Trained spotter shared a photo report, via Twitter, of hen egg size hail covering the ground.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:18:00 to 10-JUN-21 19:18:00 (MST-7)
Location: LINDSAY
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tea cup size hail.

Hail in WIBAUX, MONTANA
From 10-JUN-21 16:50:00 to 10-JUN-21 16:50:00 (MST-7)
Location: BEAVER HILL DOT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of golf balls.

Hail in RICHLAND, MONTANA
From 10-JUN-21 17:16:00 to 10-JUN-21 17:16:00 (MST-7)
Location: CRANE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public measured golf ball size hail.

Thunderstorm Wind in GARFIELD, MONTANA
From 10-JUN-21 18:30:00 to 10-JUN-21 18:30:00 (MST-7)
Location: COHAGEN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a tree, with a trunk at least 12 inches in diameter, blown down, as well as pea size hail in drifts.

Hail in SHERIDAN, MONTANA
From 10-JUN-21 15:00:00 to 10-JUN-21 15:00:00 (MST-7)
Location: REDSTONE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, golf ball size hail.  Time and location are estimated.

Hail in PETROLEUM, MONTANA
From 10-JUN-21 15:10:00 to 10-JUN-21 15:10:00 (MST-7)
Location: FLATWILLOW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, quarter size hail located off of US Highway 87, five miles north of the Musselshell County line.  Time estimated from radar.

Hail in RICHLAND, MONTANA
From 10-JUN-21 15:30:00 to 10-JUN-21 15:30:00 (MST-7)
Location: SIDNEY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via facebook, hen egg size hail located along the lost highway near Sidney.

Hail in PRAIRIE, MONTANA
From 10-JUN-21 18:55:00 to 10-JUN-21 18:55:00 (MST-7)
Location: MC CLOUD
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tea cup size hail, along with torrential rainfall.

Thunderstorm Wind in PRAIRIE, MONTANA
From 10-JUN-21 18:55:00 to 10-JUN-21 18:55:00 (MST-7)
Location: MC CLOUD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees damaged: Ash trees snapped; Apple trees blown down; and an 80-year old spruce tree blown down.

Hail in PRAIRIE, MONTANA
From 10-JUN-21 19:00:00 to 10-JUN-21 19:00:00 (MST-7)
Location: MC CLOUD
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hen egg size hail.

Hail in SHERIDAN, MONTANA
From 10-JUN-21 15:42:00 to 10-JUN-21 15:42:00 (MST-7)
Location: ANTELOPE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball size hail.

Thunderstorm Wind in PRAIRIE, MONTANA
From 10-JUN-21 19:08:00 to 10-JUN-21 19:08:00 (MST-7)
Location: MC CLOUD
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Big Sheep Mountain RAWS site (LCFM8) recorded a 59 mph thunderstorm wind gust.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 19:15:00 to 10-JUN-21 19:15:00 (MST-7)
Location: LINDSAY DIVIDE DOT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hurricane force wind gusts, power poles nearly blown over, and 75-year old trees blown over.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:15:00 to 10-JUN-21 19:15:00 (MST-7)
Location: LINDSAY DIVIDE DOT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported baseball size hail, possibly larger.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:35:00 to 10-JUN-21 19:35:00 (MST-7)
Location: LINDSAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of quarters.

Heavy Rain in VALLEY, MONTANA
From 10-JUN-21 19:40:00 to 10-JUN-21 19:40:00 (MST-7)
Location: LUSTRE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported more than four inches of rainfall.

Hail in DAWSON, MONTANA
From 10-JUN-21 19:45:00 to 10-JUN-21 19:45:00 (MST-7)
Location: RICHEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of quarters covering the ground.

Hail in SHERIDAN, MONTANA
From 10-JUN-21 15:13:00 to 10-JUN-21 15:33:00 (MST-7)
Location: ANTELOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail, which lasted for 20 minutes, along with heavy rain.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-JUN-21 15:36:00 to 10-JUN-21 15:36:00 (MST-7)
Location: ANTELOPE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a 60 mph thunderstorm wind gust.

Hail in RICHLAND, MONTANA
From 10-JUN-21 14:33:00 to 10-JUN-21 14:33:00 (MST-7)
Location: LAMBERT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported walnut size hail.

Hail in ROOSEVELT, MONTANA
From 10-JUN-21 14:37:00 to 10-JUN-21 14:37:00 (MST-7)
Location: CULBERTSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter size hail and heavy rain.

Thunderstorm Wind in DANIELS, MONTANA
From 10-JUN-21 13:58:00 to 10-JUN-21 13:58:00 (MST-7)
Location: FLAXVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a grain bin destroyed south of Flaxville on the R-Y Road.  Time estimated from radar.

Thunderstorm Wind in DAWSON, MONTANA
From 10-JUN-21 19:48:00 to 10-JUN-21 19:48:00 (MST-7)
Location: RICHEY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated a 70 mph thunderstorm wind gust which blew some tree branches down.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: ENID
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Badger Creek mesonet site (FW2498) measured a 61 mph thunderstorm wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: SAVAGE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet site (FW8536), located northwest of Savage, measured a 66 mph thunderstorm wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 10-JUN-21 20:00:00 to 10-JUN-21 20:00:00 (MST-7)
Location: SAVAGE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The mesonet site (DW8636), 2 N Savage, measured a 66 mph thunderstorm wind gust.

Thunderstorm Wind in MCCONE, MONTANA
From 10-JUN-21 19:38:00 to 10-JUN-21 19:38:00 (MST-7)
Location: COW CREEK DOT
Magnitude: 91.00 EG
Property damage: 1.20M
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several power line poles (both from the local electric cooperative and the Department of Energy, which were replaced in recent years) were snapped at their bases in this area.  A nearby home weather station recorded a 79 mph thunderstorm wind gust.