A line of showers and thunderstorms develop east of the Southern Rocky Mountain Front and move northeastward across the area. These storms move into a moist environment with good jet dynamics, wind shear, and instability. As a result, a severe thunderstorm watch is issued for most of the CWA. The primary thunderstorm threats are severe hail of equal to or greater than quarter size and wind gusts of up to 60 to 80 mph. Heavy downpours of rain are also expected.

Hail in JEFFERSON, MONTANA
From 27-JUN-19 13:25:00 to 27-JUN-19 13:25:00 (MST-7)
Location: CLANCY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Second hand report of quarter size hail reported in Clancy by KRTV.

Hail in CASCADE, MONTANA
From 27-JUN-19 15:03:00 to 27-JUN-19 15:03:00 (MST-7)
Location: GREAT FALLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

One inch hail measured.

Hail in CASCADE, MONTANA
From 27-JUN-19 15:05:00 to 27-JUN-19 15:05:00 (MST-7)
Location: GREAT FALLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail reported on the northwest side of Great falls.

Hail in CASCADE, MONTANA
From 27-JUN-19 15:16:00 to 27-JUN-19 15:16:00 (MST-7)
Location: BELT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Social media post on KRTV weather page.

Hail in JUDITH BASIN, MONTANA
From 27-JUN-19 16:13:00 to 27-JUN-19 16:13:00 (MST-7)
Location: BENCHLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch hail measured.

Hail in BLAINE, MONTANA
From 27-JUN-19 17:40:00 to 27-JUN-19 17:40:00 (MST-7)
Location: ADAMS SIDING
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Measured north of Chinook near the Canadian border. Storm is showing signs of rotation with wall cloud, but not dropping anything at the moment. Truck windshield damaged.

Tornado in JUDITH BASIN, MONTANA
From 27-JUN-19 16:10:00 to 27-JUN-19 16:10:00 (MST-7)
Location: BENCHLAND
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado near Benchland at 510 PM. Classified as an EF0 Tornado with a peak wind estimated between 75 and 85 MPH. It was 400 yards wide and was on the ground for about a quarter of a mile. The tornado lifted near 515 PM.

Thunderstorm Wind in CASCADE, MONTANA
From 27-JUN-19 15:15:00 to 27-JUN-19 15:15:00 (MST-7)
Location: BELT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gust estimated to be at least 70 mph. Power outage. Knocked over trees onto houses on 4th Avenue South.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 17:35:00 to 27-JUN-19 17:35:00 (MST-7)
Location: CHINOOK
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reports at least on tree down partially blocking a road south of Chinook.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 18:04:00 to 27-JUN-19 18:04:00 (MST-7)
Location: FT BELKNAP AGENCY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Electricity outage occurred.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 18:25:00 to 27-JUN-19 18:25:00 (MST-7)
Location: TURNER
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Aerial photo and damage indicate a macroburst went through this region. Damage path was over 5 miles long. Wind Speed estimated between 70 and 90 mph. New mobile home windows bowed in. Insulation pulled out under roof. 12 large T.

Thunderstorm Wind in LEWIS AND CLARK, MONTANA
From 27-JUN-19 13:11:00 to 27-JUN-19 13:11:00 (MST-7)
Location: WEED
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gust of 66 MPH measured at the MacDonald Pass DOT sensor.

Thunderstorm Wind in CASCADE, MONTANA
From 27-JUN-19 14:07:00 to 27-JUN-19 14:07:00 (MST-7)
Location: MID CANON
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm wind gust of 62 MPH near the MDT Dearborn sensor.

Thunderstorm Wind in CASCADE, MONTANA
From 27-JUN-19 15:14:00 to 27-JUN-19 15:14:00 (MST-7)
Location: RAINBOW
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gust of 50 kts/58 mph measured.

Thunderstorm Wind in CASCADE, MONTANA
From 27-JUN-19 15:15:00 to 27-JUN-19 15:15:00 (MST-7)
Location: BELT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gust estimated to be at least 70 mph. Power outage. Knocked over trees onto houses on 4th Avenue South.

Thunderstorm Wind in CASCADE, MONTANA
From 27-JUN-19 15:30:00 to 27-JUN-19 15:30:00 (MST-7)
Location: WAYNE
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gust of 50 kts/58 mph measured.

Thunderstorm Wind in JUDITH BASIN, MONTANA
From 27-JUN-19 15:45:00 to 27-JUN-19 15:45:00 (MST-7)
Location: MERINO
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

K1BM bravo awos station.

Thunderstorm Wind in CHOUTEAU, MONTANA
From 27-JUN-19 16:19:00 to 27-JUN-19 16:19:00 (MST-7)
Location: GERALDINE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gust of 54 kts measured.

Thunderstorm Wind in FERGUS, MONTANA
From 27-JUN-19 16:33:00 to 27-JUN-19 16:33:00 (MST-7)
Location: HOOSAC
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Wind gust of 50 kts/58mph measured and reported.

Thunderstorm Wind in CHOUTEAU, MONTANA
From 27-JUN-19 16:44:00 to 27-JUN-19 16:44:00 (MST-7)
Location: BIG SANDY
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust of 67 kts.

Thunderstorm Wind in FERGUS, MONTANA
From 27-JUN-19 16:49:00 to 27-JUN-19 16:49:00 (MST-7)
Location: MOULTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated gust of 52 kts.

Thunderstorm Wind in FERGUS, MONTANA
From 27-JUN-19 16:49:00 to 27-JUN-19 16:49:00 (MST-7)
Location: WINIFRED ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust of 51 kts.

Thunderstorm Wind in HILL, MONTANA
From 27-JUN-19 16:55:00 to 27-JUN-19 16:55:00 (MST-7)
Location: (HVR)HAVRE CITY-CO A
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust of 50 kts.

Thunderstorm Wind in HILL, MONTANA
From 27-JUN-19 16:55:00 to 27-JUN-19 16:55:00 (MST-7)
Location: (HVR)HAVRE CITY-CO A
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Havre AP khvr asos station.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 17:30:00 to 27-JUN-19 17:30:00 (MST-7)
Location: CHINOOK HEBBELMAN AR
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured wind gust of 60 kts. Time estimated from radar.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 17:48:00 to 27-JUN-19 17:48:00 (MST-7)
Location: CHINOOK
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gust measured 54 kts.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 18:18:00 to 27-JUN-19 18:18:00 (MST-7)
Location: FT BELKNAP AGENCY
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust of 64 kts at mesonet station fblm8 Fort Belknap raws.

Thunderstorm Wind in BLAINE, MONTANA
From 27-JUN-19 18:00:00 to 27-JUN-19 18:00:00 (MST-7)
Location: CHINOOK
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Measured wind gust of 50 kts at awos station ks71 Chinook Apt.