23-24

Reactive snow in beehive basin

Date
Activity
Skiing

No new/different signs of instability in the snow pack from the forecast or observing other skiers and poking around in the basin. Snow pack is between 1-2 feet from trail head to 9200 ft, 95% faceted and the rest surface hore or the trace of new snow. The pack is 100% rotten. With no slabs there wasn’t any propagating but with a heavy ski cut two of the point releases were triggered and the third when skiing. All three went to the ground. All triggered after the first skier made no impact on the slope, no visual signs or “poor” test results. A reminder how poor the snow structure is this year.

Region
Northern Madison
Location (from list)
Beehive Basin

Blackmore

Date
Activity
Skiing

Gusty winds were transporting snow into drifts that formed cohesive wind slabs. Variable snow condition with a notable sun crust under the drifted snow (45.44653, -110.99872). Witnessed a dry slab natural avalanche start from near the summit of Blackmore mountain that ran into the main bowl. Multiple other observations of small loose avalanche activity on Blackmore mountain. The trail out was exceptionally rocky.

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Devin

Not a great testament to the snowpack

Date
Activity
Skiing

Surface Hoar all over including just below the new dusting of snow. Test on a northeasterly facing slope at 8000ft, had an ECT N at about 20 hits. It failed on a crust approx 10-15cm off the ground. 

Region
Southern Madison
Location (from list)
Telemark Meadows

GNFAC Avalanche Forecast for Sat Jan 6, 2024

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>Triggering an avalanche in wind drifted snow is the primary concern today. A couple inches of light snow fell yesterday morning and winds have been strong and gusty. This has built slabs on top of the very weak snowpack that developed during our extended dry spell (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=Zv3pmhbGE54"><span><span><span><strong>… Fork video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, </span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=DXw5Dvhntgc"><span><span><span><strong>… Rind video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, </span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=gJP7UA8qVqc"><span><span><span><strong>… Basin video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>).&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Yesterday we had several reports of higher snowfall totals (5-6”) than weather stations reported (in Cooke City and N. Madison Range). We also got reports of wind drifts up to a foot deep. As you travel today, keep a close eye on the depth of new and windblown snow. The thickness of the slab of new snow is going to be the critical factor determining how likely you are to trigger a slide, and if you do, how big and dangerous that slide will be. Be very wary of any slope with more than 6” of new and wind drifted snow. Keep an eye out for changing conditions and new slopes being loaded as the wind direction shifts today and snowfall starts in the southern areas.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>With the new snow falling on such a weak snowpack full of persistent weak layers, avalanches may break further above you, wider, and less predictably than you’d typically expect with new snow or wind slab avalanches.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>On slopes without wind effect, the light new snow hasn’t built a deep or substantial enough slab to avalanche.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Look out for signs of wind drifting and signs of instability (cracking, collapsing, recent avalanches) before getting onto steep slopes. Be ready to adjust your travel plans if you see these signs.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger today is MODERATE on windloaded slopes and LOW on all other slopes.</span></span></span></span></span></span></p>

Upcoming Avalanche Education and Events

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

Loose Snow Avalanches on Henderson Mountain

Henderson Mountain
Cooke City
Code
L-N-R1-D1-I
Aspect
E
Latitude
45.05170
Longitude
-109.94400
Notes

Skiers saw recent avalanche activity north of Cooke City. These avalanches happened following a storm on 01/04 into 01/05 and likely broke early on the morning of 01/05. 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

A Morning Surprise on Henderson

Date
Activity
Skiing
Snowmobiling

We were the first to arrive at the bottom of Lulu Pass this morning and observed 3 natural avalanches on E and NE aspects of Henderson Mountain. The turn off from HWY 212 towards Lulu pass had received 4-6in of low density snow the night before, the bottom of Henderson Bench had only received 2-3in, but some areas on the trail had pockets of blown in snow around 6in deep in drifts. Hand pits quickly showed that the new snow was sitting on our thin base of faceted snow and surface hoar. The avalanches appeared to release from small cornice collapses on the ridge of Henderson Mountain. 

Region
Cooke City
Location (from list)
Henderson Mountain
Observer Name
John Padilla

Recentish avalanche activity Beehive

Date
Activity
Skiing

Hey y'all! Not sure if this has been sent into y'all or not but thought I'd send it your way. Didn't get up to it, I'd guess a couple days old? At first I thought wet slide but then looking at the trees to the left I thought maybe it was a small crown? None the less enjoy! It's just up Basin from hidden gem on the sameish aspect.

Region
Northern Madison
Location (from list)
Beehive Basin
Observer Name
N. VanTassel