Snow Observations List

Took a quick trip up Beehive Basin to the prayer flags, down into the meadows towards Bear Basin and returned the way we came.

Found around 4" of new snow from yesterday. There were scoured areas near the ridgeline on the west face, but we didn't find any cohesive wind drifts.

We dug two quick pits on the east facing terrain dropping towards Bear Basin. In our upper pit (NE aspect, 9200 ft), we found a layer of small facets (1 mm) buried a foot down, under the snow that has fallen in the past week. It didn't react in our Extended Column Test (ECTN25), but we hadn't had any reports of these facets previously, so it was a little bit surprising. We dug again, a little lower (~8900) to see if we would find it again, but it didn't exist in that location (instead there was a stout melt-freeze crust under this weeks snow). 

There was a thin, breakable, melt-freeze crust under yesterday's 4" of new snow on any slope that wasn't a little shaded. Slopes with a northward tilt, or in the shade of trees, didn't have the breakable crust. 

Despite high clouds, the snow surface was starting to get damp in the early afternoon and there were roller balls beneath our ski tracks. We saw a fresh wet loose slide on an low elevation west facing slope in Bear Basin.

Otherwise, we saw no signs of instability. 

Skied a lap on Texas Meadow north of Bridger this afternoon. There were about 2" of new snow from today and 10-12" settled new snow that fell since last Friday. A few moderate gusts moved snow, but wind was not generally light. There was minimal fresh drifting, limited to ridgelines and openings in the trees.

A lot of ski tracks off the ridge north of the ski area. Only small loose snow slides were triggered from what I could tell, under mostly cloudy skies.

Snowpit at 7700', NE aspect showed a 6 foot deep, stable snowpack (profile attached). New snow creates the main avalanche concern, mainly where it is drifted into stiffer slabs. Dry Loose snow avalanches are a second concern for now.

On this first day of spring, Ian and I toured up the northern ridge above Hebgen Lake today looking for weak snow near the base of the snowpack. Throughout the day, it snowed a little over an inch with bursts of sunshine in and out.

From the storm over the weekend, we noted about 1.5" of new and settled snow. We saw no cracking or collapsing or any other signs of instability. 

We dug a snowpit at 8900' on a NE aspect (HS: 163), and while we found faceted snow at the bottom of the snowpit, beneath the dirt layer, we were only able to get propagation on this layer after extra hits. We got a few ECTN's (7, 17) higher up in the snowpack. 

While we were encouraged by how few signs of instability we saw today, we are not ready to discount the possibility that avalanches could break on these weak layers, especially after seeing the persistent weak layer avalanche yesterday in the Taylor Fork. As always, if choosing to travel in steep terrain, use safe travel practices: one at a time on steep slopes, carry rescue gear, and regroup in safe zones. 

All elevations in Island Park experienced heavy snowfall combined with high winds,this made for unstable wind slabs and cornices. 

Dug a pit and did a ECT. Stayed off of wind-loaded slopes and found phenomenal skiing. On very steep pitches we found some dry loose activity. 

We found 175cm of snow 

ECTX4@ 168cm

ECTX24@105cm

35 degree slope. 7150 ft

North facing - 10 degrees

It looked like there were several small wind slabs triggered on Saddle Peak. I was skiing with my family and didnt get a good look or a photo. One appeared to be just off the summit maybe 12" deep and not running very far at all. The other appeared to be near the going home chute even with the cliffs, and this one ran a bit further. These wind slabs looked like something to be looking for but also easy to avoid.

Today we saw a D2 slab avalanche at Goose Lake, E facing, 10800 ft. We estimate this avalanche to have ran in the early hours of 3/17. This was the only avalanche we observed in the past 4 days. 

We rode the motorized zone today with Bill and noticed two slides. One on the SE face of Scotch Bonnet in Tragenic Bowl and one on the NE face of Wolverine. They both broke 2-4’ deep. The avalanche on Wolverine slide aprx 1500’. Both were in wind loaded areas at upper elevations. Ski cuts with snowmobiles were not producing avalanches in protected areas. 

From FB message. Today (3/19) in Taylor Fork

We went into the Lawnmower in the Deep Creek area. Although Kyle and Haylee had skied in the zone, this was my first time there. For me this was a terrain and snowpack familiarization day. First impressions, that is a scary piece of avalanche terrain and a beautiful area. We skinned up the northwest ridge system and dug two-thirds of the way up and again at the top. In our snowpits, we tried to capture a good picture of multiple elevation bands that encompass the potential starting zones of the run and develop a picture of what we might encounter. Snowpits were 190-265 cm deep and largely resembled what I have seen in the northern Gallatin Range. From my understanding, this is an unusually deep and strong snowpack for the area. The basal facets were the most concerning layer in our 190cm pit (1000' vertical below the top). These were 1 Finger minus to 4 Finger plus hardness and rounding. We just dug to the dirt layer on our upper pit. There was 50-70 cm of settled new snow from this weekend's storm cycle. We got ECTN15 results at the interface below the recent snow (see attached snowpits). 

With no signs of instability, a strong snowpack structure, no recent avalanche activity in the visible terrain around us, calm conditions/ no wind-loading, and stable results in our snowpits, we choose to ski the main run. We did discuss that due to the nature of the terrain, each skier would be effectively solo for periods of time because there are limited areas to stop that aren't exposed to the avalanche hazard. 

One skier triggered a very small loose snow avalanche that ran 50 vertical feet at the top of the run. Other than that, the descent was uneventful. 

Temps at the car when we got back at 3 PM were 37 degrees. With sunny skies, the snow on south and west-facing terrain was getting moist and sticky, but we did not observe any wet snow activity. 

We were split boarding south of Cooke City today, up to terrain around 10'000', and finding good snow stability.

Weather was mostly cloudy in the am, partly cloudy in pm.  Light winds from the SW.

No fresh avalanche activity observed.  Attached is a photo of the only sign of a recent avalanche we could find.  (an old crown on an East aspect at 9600').

No collapsing no cracking.  

Storm snow:  was measuring the HN to be around 50cms at 8500', and 70+cms at 9500'.

With a snowpit attached from a E, NE aspect around 9500'.  CTN.

Wind effect:  significant in localized places, from the St. Patrick's Day event.  Wind drifts were not sensitive where we were traveling.

Skier caught and carried approx 100 yards thru pinch of main pinnacle chute. Skier was not buried but did lose ski. Suspected culprit of avalanche was cornice drop or skier above sliding down into us. We observed little to no movement or activity before dropping into line besides prior day cornice drop slides. Slide footage can be found @0:55 mark of linked video

https://www.instagram.com/reel/DHZhI6DMGse/?igsh=YWgxd3cyaGpzY3F5

Location: Mount Maurice 

Aspect: N

Elevation: 7,600'

We found a 100cm deep snowpack. In our pit, we got an ECTn13 at 65cm on a melt/freeze crust. We found a layer of facets at the ground that was 5-10cm thick, but we were unable to impact that layer in our tests. We noted other melt freeze crusts and the Feb 4 dirt layer between the new snow on the surface and the layer of facets at the ground.  

Toured into Frazier basin today. Saw cracking in wind drifted snow near a ridge top at 8500’. The cracks were about 15 ft across. The drifted snow was about 1-1.5ft thick and still pretty soft. New snow depths varied, some areas were completely scoured. 

After a weekend of stormy weather, dropping about 1 foot of snow (~1" of SWE) on the ground, we toured out to the Throne today to see how the new snow had settled and what the winds had done to it. As we approached the main face, we noted swirling winds transporting a fair amount of snow. Generally, winds blew out of the north with gusts from all sorts of directions throughout the day.

Despite the active snow transport, east facing snow surfaces were still soft with minimal to no slab development. We did not note any signs of instability as we traveled up the face. As we neared the ridgeline and shifted to a more southerly aspect, we noted scalloped and scoured snow surfaces and the development of thin wind skins and a few 1-2" wind slabs. We dug a snowpit on a southerly aspect at 8360' (HS: 212) and got an ECTP12 on an 18" wind slab. This test result, as well as the few small wind slabs we noted were the only signs of instability seen today. We chose to stay off of steep southerly terrain and traveled back to the main face where winds had minimally impacted snow surfaces. 

On the ride out, we had great views of the Bridger Ridge and did not see any signs of new avalanches across this broad area. 

In the last five days, this area has received snowfall containing 4.5-5.3 inches of water which has settled to about 3 feet of new snow. Winds last sunday night from the southwest reached speeds up to 80 mph before easing, but then they blew from the north today.

We saw a handful of avalanches above treeline terrain that seemed to be wind slabs. However wind and snow had obscured them and I suspect there had been a lot more. 

No cracking in the new snow and one possible collapse. Interestingly - My stability test scores had actually improved since Friday when there was less new snow. They broke and propagated just under a crust under the new snow. ECTP12's on Friday. ECTN & ECTP25 today. The reason is that they have been breaking on old, broken snowflakes....not facets.

Key points

• The new snow seemed mostly stable on sheltered slopes
• Wind loading is the main issue.
• With this kind of loading, it often finds weaknesses in the snowpack. I don't expect any moster slides, but also wouldn't be surprised to hear of one being triggered if tomorrow were a busy weekend day with lots of people out
• Avoid alpine terrain above treeline where winds have drifted lots of snow. Avoid hanging out in runout zones of big paths

Toured up to the meadows below Ross Peak today.  Didn't see much cracking within the new snow (mostly just directly under our skis).  At around 8000' we found a foot of right side up snow above a crust.  I dug a hand pit below the crust and didn't get any planar failure.  On our way down we started to see the surface snow getting heavier as it warmed up.

We were in a fairly protected zone but saw a few small patches of soft wind slab and noticed snow being transported over the ridge above us when visibility was good.

The snow ranger crew was riding around the Bridgers today and we spotted this slide in the bowl to the south of Hardscrabble peak.  It looked fairly recent (last 2 days) but a little hard to tell due to the new snow since yesterday and blowing snow today.  It seems likely that it is one of the slides reported in an observation yesterday.  We had a nice view of it as we rode out so I figured it was worth a picture.  

As for the riding, there seemed to be about 8-12" of new snow that was bonded to the old surface pretty well.  Best riding was anywhere you could get out of the wind, so sheltered bowls or in the trees.

From IG: Nature or cornice triggered slides in Arrowhead and Hardscrabble Bowls.

We skied north of Cooke today. The storm snow is upside down with a wind slab sitting on top. There is also a new dust layer that came in last night with the extreme winds. We had two collapses while skinning and ECTP13 down 60cm at the new/old interface on top of a crust, SE aspect at 9700'. Winds were L-M out of of the W and S2 snowfall all day with 8" new during the day.