Regional Conditions for Bridgers

as of 5:00 am
Today0″ | 15-20 W
Dec 5 0″ | N/A
Dec 4 0″ | 25-40 W
8100′     12/03 at 13:00
34 ℉
0.0″New
8500′   12/3 at 17:00
23 ℉
W - 24 mph
Gusts 31mph
Bottom Line: Yesterday, Bridger Bowl Ski Patrol triggered several large avalanches breaking under hard slabs of wind drifted snow near the ridgeline. You can trigger similar slides today on high elevation slopes with thick drifts of windloaded snow. Slopes without thick winddrifts are generally stable. However, digging to evaluate the snowpack for yourself on a particular slope is the best way to avoid an unpleasant surprise.

Past 5 Days

Mon Dec 2

Moderate
Tue Dec 3

Moderate
Wed Dec 4

Moderate
Thu Dec 5

Moderate
Today

Moderate

Avalanche Activity- Bridgers

Bridger Range
Bridger Bowl
Bridger patrol triggered large slides on heavily wind loaded slopes
Incident details include images
Bridger Bowl
HS-ACc-R2-D3-O
Elevation: 8,500
Aspect: E
Coordinates: 45.8156, -110.9230
Caught: 0 ; Buried: 0

Ski patrol triggered two large hard slab avalanches, one in Slushman's Ravine and the other in Mundy's Bowl, by knocking large cornices down on the slope. One was 4' deep, AC-HS-R2-D3-O, ran 1150' vertical. The other was 2.5' deep, AC-HS-R2-D2-O, ran 650' vertical. This was their first control in this area for the season, so the snowpack is similar to backcountry.


More Avalanche Details
Northern Gallatin
Hyalite - main fork
Natural and human triggered wind slab avalanches in Hyalite
Incident details include images
Hyalite - main fork
SS
Coordinates: 45.4472, -110.9620
Caught: 0 ; Buried: 0

Observations from Hyalite today:

1. When approaching the base of Mt. Blackmore this morning at roughly 8:45am we observed strong swirling winds at higher elevations (summit of Blackmore and the Elephant/Blackmore Saddle). The winds we observed were primarily loading snow onto E and SE facing aspects. Furthermore, we witnessed four naturally triggered avalanches over a twenty minute span. All slides appeared to be D1/D2 on E and SE aspects and, seemingly, restricted to the newly loaded snow.

2. My partner and I climbed Zach Attack today. We intentionally triggered numerous size 1 wind slabs in the gully approaching the climb, which has slopes up to 35 degrees. These slabs were between 5 and 15 cm thick, up to 5m wide, 4F in hardness, touchy, and failed on lower density new snow. Although none of them ran more than 20m in this terrain, it would be a different story on steeper slopes, and if you were in an exposed position they had enough mass to push you around. Strong down and cross-slope winds formed these slabs at and below treeline, while the more alpine terrain of the climb itself was scoured.

3. Skied up in the main drainage of Hyalite today. Triggered some small wind slabs and propagating cracks. We backed off our main objective (a north facing couloir) because of these red flags and multiple crown lines on the same aspect and elevation.

 

More Avalanche Details
Bridger Range
Saddle Peak
Natural and human triggered wind slabs in the Bridger Range
Incident details include images
Saddle Peak
SS-N-D2
Aspect: E
Coordinates: 45.7943, -110.9360
Caught: 0 ; Buried: 0
From an email:
"I toured up Bridger today... We found reactive windslabs at the ridgeline. On the drive up we observed a few small avalanches in Mundies Bowl and a larger (D2) slide just north of Saddle’s north summit. All appeared to be windslabs that released at the ridgeline. We dug a pit a few hundred feet below the ridge above the entrance to 2 Way and Stuper. I’ve attached a photo of this, as well as of windslabs at the ridgeline and one of the flank of the slide on Saddle"

More Avalanche Details

Photos- Bridgers

Displaying 1 - 40
  • We went to look at the snowpack on Saddle Peak in the backcountry south of Bridger Bowl (12/5/19). Heavily wind loaded slopes have hard slabs over weak facets. Unfortunately this poor snowpack structure will be with us for a while in the backcountry. It will not get compacted by skier traffic or show obvious signs of instability. SKi patrol triggered this slide just inside their boundary. This is the first time they have done control this season, so it is a glimpse of what we might find in the uncontrolled backcountry snowpack. Photo: GNFAC

  • The Bridger Bowl Ski Patrol triggered this slide on a heavily wind-loaded east facing slope at the ridgeline. They wrote, "With a shovel push the vertical cornice/pillow broke 15''-36'' deep on a steep and rounded bulge just south of Lee's Leap running on the crust. The debris terminated well below Pat's Chute." Its code is AC-HS-R2-D2-2.5'-O-TR-650' Photo: BBSP
  • This large avalanche was triggered intentionally by the Bridger Bowl Ski Patrol at the ridgeline above little Slushman's Ravine. They were cutting a cornice and it broke 7 feet back from the edge, 4 feet deep and 150 feet wide. It was a hard slab avalanche and ran 1150 feet. It was east facing and broke on a crust formed in the early season. It's code is AC-HS-R2-D3-4'-O-TL-1150' Photo: BBSP

  • We put up the Taylor Fork weather station today (12/03) and it is churning out hourly data. Check it out here: https://www.mtavalanche.com/weather/stations/taylor-fork

  • We partnered with the Gallatin Valley Snowmobile Association to put in two new beacon checkers at the Taylor Fork and Buck Ridge trailheads. They are working great!

    Thanks GVSA! Photo: GNFAC

  • We recognize that backcountry skiing can be daunting to approach. That’s why Ben Goertzen and the Friends of the Gallatin National Forest Avalanche Center have teamed up to help breakdown some of the most prominent barriers of entry to backcountry skiing through this campaign. One lucky winner will be given a complete backcountry skiing kit, a spot in an avalanche awareness course, and featured in a three part video series that ends with an excursion into the backcountry with professional skier and filmmaker, Ben Goertzen . These videos will be used by the Friends of GNFAC to help other aspiring backcountry skiers gain awareness, knowledge and start to breakdown their barriers to entry.

    Click Here for More Details on How to Enter

    Watch the Backcountry Barriers Launch Video: https://vimeo.com/376473804

  • We skied in the northern Bridgers (12/2/19), and an unstable test result (ECTP14) prompted us to adjust our travel plans. In the mountains around Bozeman and Big Sky the snowpack is generally stable, and will get more stable without snow the next few days, but it is just as important as ever to carefully assess stability of each slope, each day you plan to ride in avalanche terrain. East aspect. 8,100' elev. Photo: GNFAC 

  • This avalanche of wind-drifted snow was triggered with a ski cut on a southeast aspect at 9,800'. Photo: T. Chingas

  • This slide was triggered up Hyalite from 100' away. It was a wind loaded slope at 9,000', northeast aspect. Photo: T. Chingas

  • From an observation:

    When approaching the base of Mt. Blackmore this morning at roughly 8:45 am we observed strong swirling winds at higher elevations (summit of Blackmore and the Elephant/Blackmore Saddle). The winds we observed were primarily loading snow onto E and SE facing aspects. Furthermore, we witnessed four naturally triggered avalanches over a twenty minute span. All slides appeared to be D1/D2 on E and SE aspects and, seemingly, restricted to the newly loaded snow. Photo: SAM

  • This natural avalanche released on Saddle Peak. wind loading from west winds created sensitive wind slabs this morning. Photo: S. Jonas

  • Skiers found reactive wind slabs near the ridge line that easily avalanched. Photo: S. Jonas

  • From obs.: "New snow from 24 hours ago blew around the ridge tops from 11pm last night until 7am this morning ~30mph. This soft 4 finger slab was about 6”-7” deep and broke on a convex roll.... We were assessing the terrain carefully and expected this result." Photo: R. Christian-Frederick

  • We triggered this dry loose avalanche on a west facing slope in Beehive Basin on 11/30. 3-5" of recent snow easily slid on top of a crust. Photo: GNFAC

  • Dry loose snow avalanches were easy to trigger on Saturday 11/30 in Beehive Basin. Photo: GNFAC

  • These small crowns indicate that new snow may not bond well to the old snow surface. Photo: B. Fredlund

  • Strong winds found snow to transport on Saturday 11/23. Photo: B. VandenBos

  • Large surface hoar in Hyalite on 11/23. Photo: C. Kussmaul

  • Shooting cracks in Hyalite at ~9500 ft on a N aspect on 11/23. 

    From obs "We got some large shooting cracks while skinning and ended up turning around." Photo: C. Kussmaul

  • From obs: "We took a tour up into the Maid today. A generally stable snowpack in the area, new snow seemed to bond well with the underneath crust layer. We did observe small pinwheels/rollers on steep pitches on southeast aspects, mostly due to the rocks heating up during the day. We also observed sluff buildup on aprons below the shadier and steep northern aspects." Photo: Tommy S.

  • Toured up to the ridge at Bridger today and traversed into Bridger Gully. At around 8,000' in the trees above the most prominent snowfield, my partner and I observed very small dry sluffs confined to the new snow.  Bellow Bridger Gully, my partner was able to release a slide while traversing through rocks above his intended line. This was on an east-southeast aspect at 7,500'. Photo: Cole Oshiro-Leavitt

  • On Thursday 11/21 skiers at Bridger noted: "...some activity (D1-D2) isolated to the new snow around rock features and ridgetops that were wind-affected..." Photo: G. Antonioli

  • On Thursday 11/21 skiers at Bridger noted: "...some activity (D1-D2) isolated to the new snow around rock features and ridgetops that were wind-affected..." Photo: G. Antonioli

  • From obs.: "I went skiing at Bridger today,... There was 4-5” of new snow, which was sitting on a firm surface. The wind had done some work, and I was able to break off a few shallow (6”) wind slabs in the first 100 feet or so off the ridge." Photo: A. Schauer

  • A skier on Saturday (11/16) took the time to dig a quick pit about 200' below east ridge of Mt Blackmore. He found about 2.5 feet of snow with a few crust layers. Photo: K. Stewart

  • This wet loose avalanche was on a west-southwest aspect in Beehive Basin. It broke to the ground (only 30 cm deep) but shows how a few hours of sun with above freezing temperatures can create wet slides, even in November! Photo: McKinley Talty

  • These feathery surface hoar crystals were buried under 5" of snow last night up Hyalite. These weak grains may become a problem with additional load. Phoro: B. VandenBos

  • "Lots of cracking up there this morning on fresh, mid elevation wind slabs"

    Photo: B. Nobel

  • "While skinning up to the top of Powder Park lift at Bridger, we had roughly 15' cracks propagate on an E/SE aspect. A snowpit showed roughly 8" of wind slab above a few inches of facets, on top of last week's rain crust." November 11, 2019.

    Photo: G. Lawrence

  • On November 8th, skiers found weak facets and surface hoar had formed during prior cold and dry weather. Keep an eye out for these weak layers if they get buried. Photo: B. VandenBos

  • On November 8th, skiers found weak facets and surface hoar had formed during prior cold and dry weather. Keep an eye out for these weak layers if they get buried. Photo: B. VandenBos

  • Wet loose avalanches at Bridger Bowl (observed on 11/5).

    Photo: G. Antonioli

  • Wet loose avalanches at Bridger Bowl (observed on 11/5).

    Photo: G. Antonioli

  • My partner and I skinned up the Middle Fork of Brackett to Ross Peak hoping to ski a few different things up there. Again, pulled the plug due to stability concerns. The snowpack was significantly thinner and weaker than what I've seen up at Bridger and older snow was moderately faceted. Encountered a few thin, natural hard slab avalanches, failing on top of a facet/ melt-layer. Photo: B. VandenBos

  • E aspect, 9,100'. Triggered from a stomping a small cornice, which landed on a steep slope below and popped a small wind slab. Photo: T. Chingas

  • A skier reported on 11/1, "Activity I observed was restricted to the new snow. A fair bit of loose snow....  Skiers on the E bowl of Blackmore triggered some D1 dry sluffage, running on a crust beneath the new snow." Photo: B. VandenBos

  • A skier reported on 11/1, "Activity I observed was restricted to the new snow. A fair bit of loose snow....  Skiers on the E bowl of Blackmore triggered some D1 dry sluffage, running on a crust beneath the new snow." Photo: B. VandenBos

  • A skier reported on 11/1, "I watched a small (D1) wind slab build and fail as the wind picked up near the Blackmore/Elephant saddle (happened just before 2pm). Slab couldn't have been much thicker than 15cm, broke 30-40m wide. These slabs were building rapidly,..." Photo: B. VandenBos

  • Avalanche crown north of Bridger Bowl from avalanches that ran on or before 10/30. Photo: G. Antonioli

  • Avalanche crown north of Bridger Bowl from avalanches that ran on or before (10/29). Photo: G. Antonioli

WebCams


Bridger Base Area

Ridge, Looking North

Bridger Lift

Weather Forecast Bridgers

Extended Forecast for

10 Miles NNE Bozeman MT

  • Today

    Today: Sunny, with a high near 34. West southwest wind around 10 mph.

    Sunny

    High: 34 °F

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 31 by 2am. Southwest wind 7 to 14 mph, with gusts as high as 20 mph.

    Mostly Cloudy

    Low: 26 °F

  • Saturday

    Saturday: Patchy blowing snow between noon and 1pm. Partly sunny, with a high near 35. Breezy, with a southwest wind 16 to 23 mph, with gusts as high as 31 mph.

    Mostly Sunny
    then Patchy
    Blowing Snow
    and Breezy

    High: 35 °F

  • Saturday
    Night

    Saturday Night: A 40 percent chance of snow after midnight.  Cloudy, with a low around 26. Southwest wind 16 to 20 mph, with gusts as high as 28 mph.  New snow accumulation of less than a half inch possible.

    Mostly Cloudy
    then Chance
    Snow

    Low: 26 °F

  • Sunday

    Sunday: Snow.  High near 30. Southwest wind around 15 mph, with gusts as high as 22 mph.  Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    Snow

    High: 30 °F

  • Sunday
    Night

    Sunday Night: A 30 percent chance of snow before midnight.  Mostly cloudy, with a low around 14. New snow accumulation of less than a half inch possible.

    Chance Snow
    then Mostly
    Cloudy

    Low: 14 °F

  • Monday

    Monday: Partly sunny, with a high near 24.

    Partly Sunny

    High: 24 °F

  • Monday
    Night

    Monday Night: A slight chance of snow before midnight.  Mostly cloudy, with a low around 14.

    Slight Chance
    Snow then
    Mostly Cloudy

    Low: 14 °F

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 24.

    Mostly Cloudy

    High: 24 °F

The Last Word

The Gallatin Valley Snowmobile Association deserves a shout-out for putting up new beacon checkers at Taylor Fork and Buck Ridge Trailheads.