24-25

Blackmore obs

Date
Activity
Skiing

Toured up to Blackmore NE Ridge, about 200 feet from the summit Tuesday. Mix of sun and clouds. very cold, light to no winds. fresh blown snow was over 1' deep up high and felt very stable. We did not notice any wind slabs though it had been windy overnight, the N.W face of elephant was completely scoured almost down to rock. Some small cornices forming on the ridge with the slightest wind skin in some places. snowpack was around 3' deep on the lee (E) side.

Region
Northern Gallatin
Observer Name
Alex A

Bridger Bowl

Date
Activity
Skiing

Dug a snow pit on a northern aspect at Bridger Bowl around 7800ft of elevation. Snow depth ranged from 45-50cm. Had a very reactive CT 2 on the most recent snow layer around 25cm deep in the snow measured from the ground up. Attempted a hasty ECT before we lost sunlight but did not get propagation. There was visible wind loading on upper elevations as well.

Region
Bridger Range
Location (from list)
Bridger Bowl
Observer Name
Simon MacLean

Right side up at Bridger

Date
Activity
Skiing

Skinned up to the top of the Pierre's Knob lift and then up the Finger's Meadow, poking into top of the 1st Finger. Total snow depth was around a foot, or a little less, in the base area. Near our high point at ~7900ft, snow depths were around 18" to two feet. A snowpit on a north aspect in the top of the 1st Finger showed a "right-side-up" snowpack, with the softest snow at the surface, getting progressively harder are you go down. ECTX. A little bit of faceting was visible in the older snow, but it hadn't done much weakening. A quick hand pit on an east aspect in the Finger's Meadow showed a similar snowpack structure. Plenty of snow to trigger a slide, but still a very thin snowpack with buried rocks remaining a huge hazard.

No avalanches or other signs of instability observed. Snowed lightly but consistently all morning, with an additional inch accumulating by the time we returned to the car.

Region
Bridger Range
Location (from list)
Bridger Bowl
Observer Name
Ian Hoyer

Shooting Cracks in Beehive Basin

Beehive Basin
Northern Madison
Code
Latitude
45.34800
Longitude
-111.40300
Notes

Party of three made our way into Beehive Basin up to near the bottom of 4th of July Couloir. Noted strong winds blowing from the south southwest (up the canyon) Saw shooting cracks up to 8 feet out skinning up a boulder pile on a east facing aspect, (picture my friend took). Snowpack still to shallow to confidently ski any of the upper couloirs. Further down in the canyon on the short grassier slopes snowpack was reasonably dense and stable with a weak crust layer under 8-10 inches of the light fluffy stuff, snow depth up to 2 feet in select spots. Friend reported hearing one small whumph breaking trail up to the ridge on a convex roll. Skied out the entire slope with 10ish other people and didn't see any other signs of instability.

Number of slides
0
Number caught
0
Number buried
0
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year

GNFAC Avalanche Forecast for Tue Nov 19, 2024

Snowpack and Avalanche Discussion

<p>The snowpack is thin, but we are heading in the right direction, with 5-10” of new snow falling in our latest storm. <a href="https://nwcc-apps.sc.egov.usda.gov/imap/#version=169&amp;elements=&amp;… sites</span></a> across the forecast area report snow depths between 16 and 26 inches, with the deepest totals in the Northern Gallatin and the Southern Madison Ranges. Hitting rocks, stumps and underlying obstacles remains the most likely hazard, but yesterday’s new snow increases the odds of triggering avalanches, especially in areas where wind-drifted snow built <strong>fresh wind slabs </strong>and instability within the new snow could result in <strong>storm slab</strong> avalanches<span>.</span></p>

<p>Slopes with fresh <strong>wind slabs </strong>are the primary avalanche concern. The greater snow depths of wind-loaded slopes appeal to folks looking for early-season turns. However, these slopes are less stable and the most likely locations to encounter avalanches. Additionally, as snow drifts onto slopes, the potential size of slides increases. <span>Recent indicators of this problem include shooting cracks in Beehive Basin on Monday (<strong><a href="https://www.mtavalanche.com/images/24/shooting-cracks-upper-beehive-bas…;) and a natural wind slab avalanche in the northern Bridger Range on Sunday (<a href="https://www.mtavalanche.com/node/32141"><strong><span>photos and details</span></strong></a>).</span> Increasing winds throughout the week, even without additional snow, can worsen this problem. Avoid steep slopes with signs of instability, which include recent avalanches, shooting cracks, collapsing (whumphing), stiffening of the snow surface, or visual cues of drifting.</p>

<p>Instability within or immediately below new snow may result in smaller <strong>storm slabs</strong><span> or loose snow avalanches. This problem is generally short-lived, but a quick snowpit will tell you if persistent weak layers that develop early in the season are resulting in longer-duration</span> instability.</p>

<p>Getting captured in an avalanche of <em>any </em>size is likely to result in traumatic injuries, as victims will invariably hit the underlying obstacles during a ride. Thus, avoidance should be our objective. To reduce the consequences of a mistake, carry rescue gear, practice with it and follow safe travel protocols in and around avalanche terrain. <strong>Hunters, </strong>often traveling alone and without avalanche rescue gear, should avoid steep snow-covered slopes with more than a foot of snow.</p>

Upcoming Avalanche Education and Events

Our education calendar is full of awareness lectures and field courses. Check it out: Events and Education Calendar

Thursday, November 21, 6-7 p.m., Free Avalanche Awareness for Families and Friends at Story Mill Community Center.

Wind Slab Avalanche - Northern Bridger Range

Northern Bridgers
Bridger Range
Code
SS-R1-D1-I
Latitude
45.91960
Longitude
-110.97600
Notes

A small avalanche released in the northern bridger range on Sunday.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
Wind Slab
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year