A mildly unstable atmosphere combined with an approaching low pressure trough from the west to set off strong thunderstorms, some of which eventually spread severe wind gusts across portions of northeast Montana.

Thunderstorm Wind in GARFIELD, MONTANA
From 20-AUG-20 19:53:00 to 20-AUG-20 19:53:00 (MST-7)
Location: JORDAN AIRPORT (KJDN)
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the Jordan airport ASOS site (KJDN), a 68 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 20-AUG-20 18:45:00 to 20-AUG-20 18:59:00 (MST-7)
Location: MALTA SOUTH DOT
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Malta South US-191 DOT site (MTMAL), Multiple wind gusts of 66 mph were recorded from 18:45 MST to 18:59 MST.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:23:00 to 20-AUG-20 20:23:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the Glasgow airport ASOS site (KGGW), a 67 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 20-AUG-20 19:35:00 to 20-AUG-20 19:35:00 (MST-7)
Location: MALTA ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

At the Malta airport AWOS site (KM75), a 64 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 20-AUG-20 19:32:00 to 20-AUG-20 19:32:00 (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 sometime between 18:32 MST and 19:32 MST.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:44:00 to 20-AUG-20 20:44:00 (MST-7)
Location: KING COULEE RAWS
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the King Coulee RAWS site (KIGM8), a 64 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:03:00 to 20-AUG-20 20:03:00 (MST-7)
Location: HINSDALE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Saco US-2 DOT site (MTSCO), a 62 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 21:00:00 to 20-AUG-20 21:00:00 (MST-7)
Location: SAINT MARIE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Saint Marie MARCO site (07MT), a 62 mph wind gust was recorded.

Thunderstorm Wind in PHILLIPS, MONTANA
From 20-AUG-20 18:41:00 to 20-AUG-20 18:41:00 (MST-7)
Location: MANNING CORRAL RAWS
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the Manning Corral Dogtown RAWS site (MCDM8), a 60 mph gust was recorded.

Thunderstorm Wind in GARFIELD, MONTANA
From 20-AUG-20 20:08:00 to 20-AUG-20 20:08:00 (MST-7)
Location: SOUTH SAWMILL RAWS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the South Sawmill Creek RAWS site (SSMM8), a 59 mph wind gust was recorded.

Thunderstorm Wind in MCCONE, MONTANA
From 20-AUG-20 21:40:00 to 20-AUG-20 21:40:00 (MST-7)
Location: CIRCLE MCCONE CO ARP
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Circle Town County airport mesonet site (K4U6), a 58 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:25:00 to 20-AUG-20 20:25:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the Glasgow airport ASOS site (KGGW), a 58 mph wind gust was recorded.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:22:00 to 20-AUG-20 20:22:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer 2 NNW Glasgow estimated a 65 mph wind gust.

Thunderstorm Wind in VALLEY, MONTANA
From 20-AUG-20 20:23:00 to 20-AUG-20 20:23:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public measured a 62 mph wind gust.