A very unstable atmosphere combined with warm moist air from the southeast and a cold front from the west, to easily form and support multiple severe thunderstorms which merged into a bowing squall line and resulted in a tornado and a gustnado.

Hail in PETROLEUM, MONTANA
From 07-JUL-20 15:25:00 to 07-JUL-20 15:25:00 (MST-7)
Location: WINNETT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Petroleum County Emergency Manager reported hail up to the size of half dollars.

Tornado in PETROLEUM, MONTANA
From 07-JUL-20 15:10:00 to 07-JUL-20 15:15:00 (MST-7)
Location: DRY BLOOD CREEK RAWS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Petroleum County dispatch and Emergency Manager relayed a public report of a brief, rain-wrapped, weak tornado northwest of Winnett.  No damage was found.

Tornado in PETROLEUM, MONTANA
From 07-JUL-20 14:58:00 to 07-JUL-20 15:12:00 (MST-7)
Location: WINNETT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Petroleum County dispatch relayed a public report of a brief, weak gustnado spun up out of severe thunderstorm outflow winds southwest of Winnett.  Time estimated from radar.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:40:00 to 07-JUL-20 15:40:00 (MST-7)
Location: MALTA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, several trees blown over in the Malta Cemetery.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:55:00 to 07-JUL-20 15:55:00 (MST-7)
Location: MALTA ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported extensive roof, fence, and barn damage from severe winds, including a thirty-foot pine tree being up-rooted. Heavy rain also caused water to flow up some drains. Time estimated from radar.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 16:15:00 to 07-JUL-20 16:15:00 (MST-7)
Location: SACO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Cooperative observer reported downed tree branches, two inches in diameter.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 16:24:00 to 07-JUL-20 16:24:00 (MST-7)
Location: SACO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported extensive roof, siding, gutter, and tree damage from severe winds.  In addition, a harrow was pushed a distance of 200 feet; a grain bin was lofted up and over a wind break; some other buildings, a few bulls, and a junk pile were all carried a distance of 300 yards to a nearby lake.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 16:25:00 to 07-JUL-20 16:25:00 (MST-7)
Location: SACO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported siding and shingles peeled off a house.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:30:00 to 07-JUL-20 16:30:00 (MST-7)
Location: HINSDALE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a 30 by 60 foot shed destroyed.  Wind speed estimated.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:50:00 to 07-JUL-20 16:50:00 (MST-7)
Location: DUCK CREEK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, a roof was completely torn off a house near the Duck Creek Recreation Area.

Thunderstorm Wind in SHERIDAN, MONTANA
From 07-JUL-20 18:30:00 to 07-JUL-20 18:30:00 (MST-7)
Location: RESERVE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, a hopper bottom fertilizer bin was blown over.  Wind speed estimated.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:04:00 to 07-JUL-20 15:04:00 (MST-7)
Location: MANNING CORRAL RAWS
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the Manning Corral Dogtown RAWS site (MCDM8), at 71 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:16:00 to 07-JUL-20 15:16:00 (MST-7)
Location: ZORTMAN
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, that a 71 mph wind gust blew a tree down in Zortman.

Thunderstorm Wind in PETROLEUM, MONTANA
From 07-JUL-20 15:22:00 to 07-JUL-20 15:22:00 (MST-7)
Location: CHAIN BUTTES RAWS
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Lewsotwn Port #1 RAWS site (TR464), a 62 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:30:00 to 07-JUL-20 15:30:00 (MST-7)
Location: MALTA SOUTH DOT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Malta South US-191 DOT site (MTMAL), a 63 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:35:00 to 07-JUL-20 15:35:00 (MST-7)
Location: ZORTMAN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the Zortman BLM RAWS site (ALDM8) a 64 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:41:00 to 07-JUL-20 15:41:00 (MST-7)
Location: DODSON
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported at 75 mph wind gust at their personal home weather station.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:55:00 to 07-JUL-20 15:55:00 (MST-7)
Location: MALTA ARPT
Magnitude: 77.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Malta airport AWOS site (KM75), an 89 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:55:00 to 07-JUL-20 15:55:00 (MST-7)
Location: MALTA ARPT
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter 8 N Malta reported extensive straight-line wind damage to their property.

Thunderstorm Wind in GARFIELD, MONTANA
From 07-JUL-20 16:06:00 to 07-JUL-20 16:06:00 (MST-7)
Location: SOUTH SAWMILL RAWS
Magnitude: 74.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the South Sawmill Creek RAWS site (SSMM8), an 85 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 16:18:00 to 07-JUL-20 16:18:00 (MST-7)
Location: SACO
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Saco US-2 DOT site (MTSCO), a 63 mph wind gust was recorded.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 07-JUL-20 16:30:00 to 07-JUL-20 16:30:00 (MST-7)
Location: VOLT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple tree limbs downed.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:37:00 to 07-JUL-20 16:37:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a 58 mph wind gust from their personal home weather station.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:39:00 to 07-JUL-20 16:39:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Public reported a 63 mph wind gust from their personal home weather station.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:40:00 to 07-JUL-20 16:40:00 (MST-7)
Location: HINSDALE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public recorded a 70 mph wind gust on their personal home weather station, and measured 0.7 inch of rain.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:45:00 to 07-JUL-20 16:45:00 (MST-7)
Location: DUCK CREEK
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter at the Duck Creek Recreation Area measured a 67 mph wind gust.
Time estimated from radar.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:46:00 to 07-JUL-20 16:46:00 (MST-7)
Location: BLUFF CREEK RAWS
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the Bluff Creek RAWS site (BLUM8), a 75 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:50:00 to 07-JUL-20 16:50:00 (MST-7)
Location: BAYLOR
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public recorded a 60 mph wind gust on their personal home weather station.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 16:53:00 to 07-JUL-20 16:53:00 (MST-7)
Location: SAINT MARIE
Magnitude: 72.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Saint Marie MARCO mesonet site (07MT), an 82 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 07-JUL-20 17:03:00 to 07-JUL-20 17:03:00 (MST-7)
Location: BAYLOR
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a 58 mph wind gust.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 07-JUL-20 17:28:00 to 07-JUL-20 17:28:00 (MST-7)
Location: VOLT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Lustre mesonet site (FW0464), a 61 mph wind gust was recorded.

Thunderstorm Wind in MCCONE, MONTANA
From 07-JUL-20 17:51:00 to 07-JUL-20 17:51:00 (MST-7)
Location: COW CREEK DOT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Cow Creek MT-13 DOT site (MTCOW), a 61 mph wind gust was recorded.

Thunderstorm Wind in GARFIELD, MONTANA
From 07-JUL-20 17:54:00 to 07-JUL-20 17:54:00 (MST-7)
Location: COHAGEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Hillside MT-59 DOT site (MTHIL), a 58 mph wind gust was recorded.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 07-JUL-20 18:41:00 to 07-JUL-20 18:41:00 (MST-7)
Location: FROID
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, damage to an outdoor shed and loss of power.  Wind speed is estimated.

Thunderstorm Wind in SHERIDAN, MONTANA
From 07-JUL-20 19:01:00 to 07-JUL-20 19:01:00 (MST-7)
Location: COMERTOWN DOT
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Commertown Turn-Off MT-5 DOT site (MTCOM), a 75 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 07-JUL-20 15:55:00 to 07-JUL-20 15:55:00 (MST-7)
Location: MALTA ARPT
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter 8 N Malta recorded an 88 mph wind gust on their personal home weather station.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 07-JUL-20 16:30:00 to 07-JUL-20 16:30:00 (MST-7)
Location: VOLT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 61 mph wind gust.