A very strong low pressure system sliding down the Canadian Rockies, pushed up against higher pressure from the south and directed the resulting strong and very gusty winds through Montana.

High Wind in WIBAUX, MONTANA
From 18-NOV-15 07:31:00 to 18-NOV-15 14:15:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

In general, the stronger winds began during the early morning on the 18th and ended during the early morning on the 19th.  The peak wind gust of 60 mph was recorded at the Beaver Hill I-94 DOT site at 1:53 PM.

High Wind in DAWSON, MONTANA
From 18-NOV-15 07:31:00 to 18-NOV-15 14:15:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Across Dawson County, sustained winds of 40 mph or greater lasted from early morning to early afternoon on the 18th.  Peak wind gusts of 63 mph were recorded a few times from 11:00 to 11:40 AM on the 18th at the Lindsay Divide MT-200 DOT site.

High Wind in RICHLAND, MONTANA
From 18-NOV-15 05:53:00 to 18-NOV-15 15:55:00 (MST-7)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

At the Sioux Pass MT-16 DOT, winds suddenly gusted to 60 mph to start the event as the squall line passed through Richland County.  The peak wind gust of 61 mph was recorded there at 11:40 AM.  Winds diminished below warning criteria at 3:55 PM.

High Wind in SHERIDAN, MONTANA
From 18-NOV-15 09:30:00 to 18-NOV-15 23:00:00 (MST-7)
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

With a communications outage making area DOT site observations unavailable and with no other reports, chose to rely on the Crosby, ND RAWS site just a few miles outside the NE corner of Sheridan County, Montana, where a peak wind gust of 68 mph was recorded at 11:56 AM.

High Wind in NORTHERN VALLEY, MONTANA
From 18-NOV-15 07:44:00 to 18-NOV-15 15:00:00 (MST-7)
Magnitude: 59.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Although sustained winds of 30 to 35 mph were more common, a few stronger gusts helped to verify this warning for Northern Valley County.  A peak wind gust of 68 mph was estimated by a trained spotter located 8 miles ENE of Baylor at 2:45 PM.

High Wind in LITTLE ROCKY MOUNTAINS, MONTANA
From 18-NOV-15 05:05:00 to 18-NOV-15 12:10:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

With strong and gusty winds measured for most of the morning at the Malta South US-191 DOT site, a peak wind gust of 63 mph was recorded at 8:46 AM.

High Wind in MCCONE, MONTANA
From 18-NOV-15 08:30:00 to 18-NOV-15 17:30:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Sustained winds of at least 40 mph were common through most of the day across McCone County.  Peak wind gusts of 60 mph were recorded at the Fort Peck Dam handar site from 9:30 AM to 12:30 PM.

High Wind in GARFIELD, MONTANA
From 18-NOV-15 10:48:00 to 18-NOV-15 11:00:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Sustained winds of 30 to 35 mph and gusts of 45 to 55 mph were more common across Garfield County, but a peak wind gust of 59 mph was recorded at 10:48 AM at the Jordan Airport ASOS site.

High Wind in WESTERN ROOSEVELT, MONTANA
From 18-NOV-15 12:18:00 to 18-NOV-15 15:30:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Wind at or above 40 mph began around mid-day and ended later that afternoon with a peak wind gust of 59 mph recorded at 1:18 PM at the Poplar RAWS site.

High Wind in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 18-NOV-15 03:03:00 to 18-NOV-15 12:30:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Sustained winds of 30 to 35 mph and gusts of 45 to 55 mph were more common across Central and Southern Valley County, but a sudden peak gust of 60 mph with the passage of the squall line was measured at the Glasgow Airport ASOS site at 3:03 AM.  Sustained winds steadily dropped back down below 40 mph by 12:30 PM.

High Wind in DANIELS, MONTANA
From 18-NOV-15 11:30:00 to 18-NOV-15 13:30:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Scobey Airport mesonet site, sustained winds of 40 to 41 mph were recorded  for 2 to 3 hours through the middle portion of the day. Event times are estimated.