22-23

Whumpfing at Blackmore

Date
Activity
Skiing

Today we skied the northmost avalanche path on the east face of Blackmore; the farthest lookers right avi path before the trees. There were strong winds blowing from the southwest which created a very strong, 3-5in deep, wind crust. Certain aspects were heavily wind-loaded creating a very pocketed snowpack in some places. In the first 100 feet of my descent, I experienced three whumpfs; all of which came from different pockets of snow. Some areas appeared to be very well bonded, whereas others were far less so. We also observed multiple crowns across the eastern face, all of which appeared to have slid a few days ago. They ranged in width from 50-300ft and looked to be 1-3ft tall. The runout and debris were not visible. 

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

Avalanche near Buck Ridge wilderness boundary

Date
Activity
Snowmobiling

Avalanche (possibly sled/human triggered) on an easy to northeast facing slope around 9300 feet.  There were lots of sled tracks on the slope, which is located just out of the wilderness at the far end of Buck Ridge.  Slide and sled tracks appeared to be from after the weekend storm and we're covered with light snow from the last couple days.  Noted lots of wind transported snow along buck ridge this afternoon.

Region
Northern Madison
Location (from list)
Buck Ridge
Observer Name
Kyle M

West side avalanche photo

Date
Activity
Skiing

Impressive avalanche cycle in the Bridgers to view as the skies clear.  Most slides seemed to have happened mid storm.  Here’s some photos of a large slide on the west side/behind north boundary.  Not sure the name.

Region
Bridger Range
Location (from list)
BRIDGER RANGE
Observer Name
Brian Sienkowski

Snowslide creek area obs

Date
Activity
Skiing

Did a couple runs just to the north of bacon rind, had good runs. Dug a pit and did an ECT test at about 8300 ft on a SE aspect, snow pack was about 4 ft deep. I got an ECT-P10 with a Q2 shear quality. My column failed and propagated on a thin barely visible strip of surface hoar in between the new and old snow, there was about 12 inches of new snow. Also noticed ‘many thin (appeared to be 4-5 inches)slab crowns, on steeper terrain right off the rode near the pulloff West facing aspect, also tons of the same shallow looking crown on the spur road up to big sky on the steep south facing stuff above the road.
 

Region
Southern Madison
Location (from list)
Bacon Rind
Observer Name
Tom Grande

GNFAC Avalanche Forecast for Fri Feb 3, 2023

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>Triggering large avalanches remains possible today. Heavy snowfall at the end of last week and strong winds the last couple days pushed weak layers past their breaking point. Many large, natural and human triggered avalanches broke over the last week, including a skier triggered slide on a wind loaded slope near Big Sky yesterday (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/27962"><span><span><span><strong><span…;, </span></span></span></span></span></span><a href="https://www.mtavalanche.com/weather/wx-avalanche-log"><span><span><span… log</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). As we get further out from the big storm, it is getting harder to trigger a slide, but it is clearly still possible to trigger one, and if you do, it’ll still be large and dangerous. Strong winds the last few days blew the new snow around and kept the hazard elevated on the many slopes where drifts developed. Be extra skeptical today of slopes with recent wind drifting.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>You could trigger slides on weak layers buried 1-3 ft deep and also near the ground (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=ITX7Ic3eFYM"><span><span><span><strong>…. Bridgers video from yesterday</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). In some areas these weak layers are buried surface hoar, in others they are facets, it doesn’t really make a whole lot of difference at the moment - dig and test the layers to see how they are reacting in the area you’re in. Areas that had a thin snowpack before the recent storm remain especially concerning (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/27960"><span><span><span><strong><span… Creek observation</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=c1HCGdyzt0E"><span><span><span><strong>…. Ellis video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>)</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Keep your eyes out for signs of instability such as recent avalanches, poor test scores and whumpfs and be ready to shift gears and avoid steep slopes if you find them. If you’re going to poke into avalanche terrain, make sure you’re carrying rescue gear (beacon, shovel, and probe), going one at a time, and have a partner watching you from a safe location.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger rating has dropped to MODERATE today across the advisory area. This reflects the fact that avalanches have gotten a little harder to trigger, but does not represent a dramatic decrease in the hazard. Riding steep slopes still merits caution and requires careful snowpack assessment.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Please share avalanche, snowpack or weather observations via our</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/add/snow_obs"><span><span><span><span>…; </span></span></span></span></span></span><span><span><span><strong><span><u><span><span>website</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, email (</span></span></span></span></span></span><span><span><span><strong><span><span>mtavalanche@gmail.com</span></span></strong></span></span></span><span><span><span><span><span><span>), phone (406-587-6984), or Instagram (#gnfacobs).&nbsp;</span></span></span></span></span></span><span><span><span><span><span><span>&nbsp;</span></span></span></span></span></span></p>

KING AND QUEEN OF THE RIDGE, FEBRUARY 4TH

The King and Queen is this Saturday and we have filled all of our participant slots.

Skier triggered slide in Lone Peak backcountry

Lone Mountain
Northern Madison
Code
AS
Latitude
45.27770
Longitude
-111.45100
Notes

Big Sky Ski Patrol reported a skier triggered avalanche in "The Mullet" in the backcountry outside the ski resort boundaries. One skiers was reportedly caught and carried by the slide. The initial skier triggered slide also triggered another avalanche in the adjacent "Rattail" avalanche path. Details are second hand and specifics could not be confirmed due to low visibility.

Number of slides
1
Number caught
1
Number buried
0
Trigger
Skier
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year