An anomalously deep Pacific trough initially brought H700 (mountain top) westerly winds of 50 to 80 kts on Sunday March 28th, 2021, which eclipsed the 99th percentile of climatology over many areas during the height of the storm. A tight surface pressure gradient, mountain wave activity, along with a well mixed atmospheric profile all contributed to transferring the elevated winds to ground level. Minimum relative humidity values fell into the 15 to 25 percent range as high temperatures warmed into the 60s to near 70 degrees. These conditions increased the risk for grassland fires and contributed to the explosive growth of the Greenhouse wildfire. On the backside of the storm, a cold front provided cold air advection and pressure rises for another round of strong winds Sunday night into Monday. Robust H700 cold air advection 60+ kt winds were also instrumental for the strong surface winds and snow shower development for that time period.

High Wind in BEAVERHEAD, MONTANA
From 28-MAR-21 22:47:00 to 28-MAR-21 22:47:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Mesonet

Brenner RAWS measures 50 kt (58 mph) non-thunderstorm wind gust.

High Wind in BEAVERHEAD, MONTANA
From 29-MAR-21 00:47:00 to 29-MAR-21 00:47:00 (MST-7)
Magnitude: 61.00 MG
Reported by: Mesonet

Trapper Creek station measured a 61 kt (70 mph) non-thunderstorm wind gust.

High Wind in BLAINE, MONTANA
From 29-MAR-21 10:15:00 to 29-MAR-21 10:15:00 (MST-7)
Magnitude: 53.00 MG
Reported by: Mesonet

Hogeland 7 SE station measured a 53 kt (61 mph) non-thunderstorm wind gust.

High Wind in BROADWATER, MONTANA
From 28-MAR-21 14:54:00 to 28-MAR-21 14:54:00 (MST-7)
Magnitude: 57.00 MG
Reported by: Mesonet

Elkhorn station 8 W Townsend measured a 57 kt (66 mph) non-thunderstorm wind gust.

High Wind in BROADWATER, MONTANA
From 29-MAR-21 02:03:00 to 29-MAR-21 02:03:00 (MST-7)
Magnitude: 55.00 MG
Reported by: Mesonet

Ginger station 3 WNW Townsend measured a 55 kt (63 mph) non-thunderstorm wind gust.

High Wind in CASCADE, MONTANA
From 28-MAR-21 11:20:00 to 28-MAR-21 11:20:00 (MST-7)
Magnitude: 56.00 MG
Reported by: Mesonet

Floweree 9 WSW station measured a 56 kt (64 mph) non-thunderstorm wind gust.

High Wind in CASCADE, MONTANA
From 28-MAR-21 20:00:00 to 28-MAR-21 20:00:00 (MST-7)
Magnitude: 56.00 MG
Reported by: Mesonet

Cascade 4 E station measured a 56 kt (64 mph) non-thunderstorm wind gust.

High Wind in CASCADE, MONTANA
From 28-MAR-21 01:42:00 to 28-MAR-21 01:42:00 (MST-7)
Magnitude: 56.00 MG
Reported by: ASOS

KGTF measured a 56 kt (64 mph) non-thunderstorm wind gust.

High Wind in CHOUTEAU, MONTANA
From 28-MAR-21 04:16:00 to 28-MAR-21 04:16:00 (MST-7)
Magnitude: 54.00 MG
Reported by: Department of Highways

MDT Loma 1 N station measured a 54 kt (62 mph) non-thunderstorm wind gust.

High Wind in CHOUTEAU, MONTANA
From 28-MAR-21 04:15:00 to 28-MAR-21 04:15:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Mesonet

Fort Benton 8 ESE measured a 50 kt (58 mph) non-thunderstorm wind gust.

High Wind in FERGUS, MONTANA
From 29-MAR-21 01:05:00 to 29-MAR-21 01:05:00 (MST-7)
Magnitude: 52.00 MG
Reported by: AWOS

Oscar station measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in FERGUS, MONTANA
From 28-MAR-21 06:01:00 to 28-MAR-21 06:01:00 (MST-7)
Magnitude: 51.00 MG
Reported by: AWOS

Oscar station measured a 51 kt (59 mph) non-thunderstorm wind gust.

High Wind in FERGUS, MONTANA
From 29-MAR-21 12:00:00 to 29-MAR-21 12:00:00 (MST-7)
Magnitude: 57.00 MG
Reported by: AWOS

N Bar Ranch station measured a 57 kt (66 mph) non-thunderstorm wind gust.

High Wind in GALLATIN, MONTANA
From 28-MAR-21 11:14:00 to 28-MAR-21 11:14:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Mesonet

Sourdough station 3 SSE Bozeman measured a 50 kt (58 mph) non-thunderstorm wind gust.

High Wind in GALLATIN, MONTANA
From 29-MAR-21 02:34:00 to 29-MAR-21 02:34:00 (MST-7)
Magnitude: 54.00 MG
Reported by: Mesonet

Rainbow Pt 7 NNW West Yellowstone measured a 54 kt (62 mph) non-thunderstorm wind gust.

High Wind in GALLATIN, MONTANA
From 29-MAR-21 03:00:00 to 29-MAR-21 03:00:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Mesonet

Amsterdam 2 N measured a 50 kt (58 mph) non-thunderstorm wind gust.

High Wind in EASTERN GLACIER, MONTANA
From 28-MAR-21 10:56:00 to 28-MAR-21 10:56:00 (MST-7)
Magnitude: 51.00 MG
Reported by: ASOS

KCTB measured a 51 kt (59 mph) non-thunderstorm wind gust.

High Wind in EASTERN GLACIER, MONTANA
From 28-MAR-21 15:16:00 to 28-MAR-21 15:16:00 (MST-7)
Magnitude: 63.00 MG
Reported by: Mesonet

Cut Bank 10 S station measured a 63 kt (72 mph) non-thunderstorm wind gust.

High Wind in EASTERN GLACIER, MONTANA
From 28-MAR-21 15:49:00 to 28-MAR-21 15:49:00 (MST-7)
Magnitude: 76.00 MG
Reported by: ASOS

KCTB measured a 76 kt (87 mph) non-thunderstorm wind gust.

High Wind in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 28-MAR-21 11:24:00 to 28-MAR-21 11:24:00 (MST-7)
Magnitude: 65.00 MG
Reported by: Department of Highways

MDT Browning 2 SE measured a 65 kt (75 mph) non-thunderstorm wind gust.

High Wind in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 28-MAR-21 10:21:00 to 28-MAR-21 10:21:00 (MST-7)
Magnitude: 74.00 MG
Reported by: Department of Highways

MDT East Glacier Park 8 SE measured a 74 kt (85 mph) non-thunderstorm wind gust.

High Wind in HILL, MONTANA
From 29-MAR-21 12:20:00 to 29-MAR-21 12:20:00 (MST-7)
Magnitude: 51.00 MG
Reported by: ASOS

KHVR measured a 51 kt (59 mph) non-thunderstorm wind gust.

High Wind in JEFFERSON, MONTANA
From 29-MAR-21 12:39:00 to 29-MAR-21 12:39:00 (MST-7)
Magnitude: 52.00 MG
Reported by: Mesonet

Jack Creek 10 SE Boulder measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in JUDITH BASIN, MONTANA
From 28-MAR-21 04:04:00 to 28-MAR-21 04:04:00 (MST-7)
Magnitude: 52.00 MG
Reported by: AWOS

Bravo station measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in JUDITH BASIN, MONTANA
From 29-MAR-21 12:05:00 to 29-MAR-21 12:05:00 (MST-7)
Magnitude: 54.00 MG
Reported by: Department of Highways

MDT Geyser 2 SSE measured a 54 kt (62 mph) non-thunderstorm wind gust.

High Wind in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 28-MAR-21 09:44:00 to 28-MAR-21 09:44:00 (MST-7)
Magnitude: 68.00 MG
Reported by: Mesonet

Upper Elk Creek 14 SW Augusta measured a 68 kt (78 mph) non-thunderstorm wind gust.

High Wind in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 28-MAR-21 11:45:00 to 28-MAR-21 11:45:00 (MST-7)
Magnitude: 63.00 MG
Reported by: Mesonet

Dellwo 14 W Bynum measured a 63 kt (72 mph) non-thunderstorm wind gust.

High Wind in EASTERN PONDERA, MONTANA
From 29-MAR-21 03:15:00 to 29-MAR-21 03:15:00 (MST-7)
Magnitude: 59.00 MG
Reported by: Mesonet

Dean 7 NNE Valier measured a 59 kt (68 mph) non-thunderstorm wind gust.

High Wind in EASTERN PONDERA, MONTANA
From 28-MAR-21 16:35:00 to 28-MAR-21 16:35:00 (MST-7)
Magnitude: 58.00 MG
Reported by: Mesonet

Brandvold 2 WNW Valier measured a 58 kt (67 mph) non-thunderstorm wind gust.

High Wind in EASTERN TETON, MONTANA
From 28-MAR-21 22:45:00 to 28-MAR-21 22:45:00 (MST-7)
Magnitude: 55.00 MG
Reported by: Mesonet

Fairfield 8 ENE measured a 55 kt (63 mph) non-thunderstorm wind gust.

High Wind in EASTERN TETON, MONTANA
From 28-MAR-21 22:50:00 to 28-MAR-21 22:50:00 (MST-7)
Magnitude: 55.00 MG
Reported by: Mesonet

Fairfield 3 ENE measured a 55 kt (63 mph) non-thunderstorm wind gust.

High Wind in LIBERTY, MONTANA
From 28-MAR-21 17:15:00 to 28-MAR-21 17:15:00 (MST-7)
Magnitude: 62.00 MG
Reported by: Mesonet

Joplin 14 NNW measured a 62 kt (71 mph) non-thunderstorm wind gust.

High Wind in LIBERTY, MONTANA
From 28-MAR-21 17:03:00 to 28-MAR-21 17:03:00 (MST-7)
Magnitude: 51.00 MG
Reported by: Mesonet

Chester 13 N measured a 51 kt (59 mph) non-thunderstorm wind gust.

High Wind in MADISON, MONTANA
From 28-MAR-21 21:15:00 to 28-MAR-21 21:15:00 (MST-7)
Magnitude: 52.00 MG
Reported by: Mesonet

Virginia City 4 E measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in MADISON, MONTANA
From 28-MAR-21 16:42:00 to 28-MAR-21 16:42:00 (MST-7)
Magnitude: 53.00 MG
Reported by: Department of Highways

MDT Norris Hill 4 NNE Mcallister measured a 53 kt (61 mph) non-thunderstorm wind gust.

High Wind in MEAGHER, MONTANA
From 29-MAR-21 01:04:00 to 29-MAR-21 01:04:00 (MST-7)
Magnitude: 52.00 MG
Reported by: Mesonet

Martinsdale 9 WSW measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in MEAGHER, MONTANA
From 29-MAR-21 04:08:00 to 29-MAR-21 04:08:00 (MST-7)
Magnitude: 52.00 MG
Reported by: Mesonet

Newland Creek 13 N White Sulphur Springs measured a 52 kt (60 mph) non-thunderstorm wind gust.

High Wind in SOUTHERN LEWIS AND CLARK, MONTANA
From 29-MAR-21 14:30:00 to 29-MAR-21 14:30:00 (MST-7)
Magnitude: 56.00 EG
Reported by: NWS Employee

About 20X30 feet of metal roof torn of a building. Tree branches 6 inches in diameter snapped at bottom of a tree.

High Wind in SOUTHERN LEWIS AND CLARK, MONTANA
From 29-MAR-21 02:21:00 to 29-MAR-21 02:21:00 (MST-7)
Magnitude: 55.00 MG
Reported by: Department of Highways

MDT Bowman's Corner 17 SW Simms measured a 55 kt (63 mph) non-thunderstorm wind gust.

High Wind in TOOLE, MONTANA
From 28-MAR-21 15:14:00 to 28-MAR-21 15:14:00 (MST-7)
Magnitude: 61.00 MG
Reported by: Mesonet

Fenger 11 SSW Whitlash measured a 61 kt (70 mph) non-thunderstorm wind gust.

High Wind in TOOLE, MONTANA
From 28-MAR-21 17:22:00 to 28-MAR-21 17:22:00 (MST-7)
Magnitude: 59.00 MG
Reported by: Department of Highways

MDT Sunburst measured a 59 kt (68 mph) non-thunderstorm wind gust.

High Wind in BLAINE, MONTANA
From 29-MAR-21 10:18:00 to 29-MAR-21 10:18:00 (MST-7)
Magnitude: 59.00 MG
Reported by: Mesonet

Fort Belknap 13 S station measured a 59 kt (68 mph) non-thunderstorm wind gust.

Wildfire in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 28-MAR-21 10:00:00 to 28-MAR-21 10:00:00 (MST-7)
Reported by: Other Federal Agency

At 1100 am MDT, a fast moving grass fire broke out northeast of the Browning area as winds gusted up to 70 mph over the area. Three structures were destroyed and the cost to contain the fire was about $100,000. The fire burned about 14,000 acres, before snow slowed it's growth during the evening and overnight hours. Crews continued fire containment through April 16th, 2021.