Snow Observations List

Toured up around bell lake today and after a night of wind, triggered a very small wind slab in a north facing couloir at around 9500-10000ft. It was almost 10” deep and was about 10-15ft across. Snow was being loaded through out the day and was staying cold up high. 

Dug a pit around 9700' on a WNW shaded aspect below a couloir on Miller Mountain in Cooke City. We found ~95cm snowpack, with 5-10" of lower-density fresh snow. We dug to the ground and found a consistent and firm snowpack all the way down, didn't find any facets at the ground. Isolated cracking, ECTN25 ~20-25cm down, below the thick melt-freeze crust from the warm-up immediately before this week's snow. The fresh snow had sluffed out on most chutes before we got there (likely during the storm) but we saw very little sluff triggered by our skiing

The fresh snow skied great on shaded aspects that hadn't been affected by wind. Non-shaded snow surfaces were definitely getting wet by 1 pm, the sun felt hot, but we didn't observe any wet slides before we left. The snow on the ride out was very wet, with watery-slush puddles on the lower parts of the trail.

Cookes' always interesting in the spring, deep slab goes to sleep and the Grizzlies wake up. Curious how she knew to thread the cornice just right(Sheep Mt). Second Pic is a large sluff on the Fin, couldn't quite make out the track route till I drove to Silver Gate. He skied the hanging gully to the east of the third pic and rock climbed across the cliff to this sluff and tracks... Don't ask how I know it was a grizz, no time to get a pic.

We saw several loose avalanches on WSW, ESE & SSE aspects of the ridge between beehive and bear basin.  The one on the ESE slope may have been skier triggered (by another group) and the rest appeared to be natural.  We found a strong crust beneath the foot of new snow throughout our route.  We didn't see any cracks or whumphs, and the new snow wasn't reactive in hand pits.  The snow surface was getting wet as we exited to the beehive trailhead around 3pm.

Out in the Western Tobacco Roots today. Recent snow was decently wind affected and storm depths were particularly variable. One thing was common with all new snow deposits: they were bonded very poorly to the widespread underlying crust. In most areas the new snow was not cohesive or deep, so this resulted only in tricky skinning and long running sluffs.

However, where wind or sun had strengthened the slab this surface layer was reactive, with sluffs entraining significant amounts of snow and one small slab that I managed to trigger. I popped this slab underneath a mild, somewhat cross-loaded convexity on a north face near treeline, and it broke around 30 feet wide, 4-6 inches deep, and ran ~ 300 feet (N, 9500', SS- ASu - R1/D1).

The underlying snowpack showed no signs of instability, though while boot packing I did break through the crust in some shallower areas and found some basal facets. The snow surface stayed pretty cool throughout the day above 8.5 kft, and winds were light out of the west.

Skied the Banana Coulior off Ross today. 6-8" of fresh, dry snow has fallen and lies above a bomber crust that was observed on all aspects we traveled on. The weak interface between new, dry snow and the pervasive crust allowed for a large sluff, or dry-loose slide, that began near the top of the Banana Coulior and ran for ~ 500'

From IG message 4/17/24: "Remote trigger up little bear today. Went to the groundish."

Wet slab 150-200 ft across, SE shoulder of Abundance towards Wolverine. Looks to have maybe happened before new snow. New snow 6-8 was extra funky, 2-3 powder on a rain? crust on heavy wet. Bonded to unsupportive melt freeze on completely saturated glop. Lots of short running sluffs

From IG: A group of riders noted very wet snow west of Cabin Creek and Southwest of the Taylor Fork. They were sinking to the ground where it was unconsolidated. The group remotely triggered a wet slab avalanche from the ridge top. There were shooting cracks that connected their location to the avalanche. This is an interesting of persistent weak layer and wet snow avalanche problems. 

From IG: Wet slide to the ground above Quake Lake. 

On sunday 4/14 a large wet loose avalanche ran naturally in closed terrain at Bridger. The larger of the two in the photo is from 4/14 at 1230pm. The other slide, on the left, happened yesterday or late in the day Friday.

Saw what looked like a wet slab avalanche from the road along the Madison River.  Roughly north facing slope at 7500'.

Saw a slab avalanche on a NE face at around 9000-10000 feet. Did not see any signs of instability on the tour, but there was not a very concrete freeze. Everything below 8000 remained unfrozen. 

This afternoon I drove up Bridger canyon to Seitz Rd to see the extent of wet snow activity, and stopped in a few places to look with binoculars. There were many loose wet avalanches that ran over the last 1-3 days. I estimate they involved the upper 6-12" of snow. Activity was widespread and many slides were plenty large enough to be dangerous, but there was nothing especially remarkable about the size and I saw zero wet slabs.

Temperature was 65-70 degrees in the canyon, mostly clear skies with a few clouds, calm to light wind.

Natural cornice failure and small slab on Iceberg Peak’s NE face. We skied by the day prior and judging by what the wind did to our tracks overnight, this looked like it happened in the morning.

Rode from Buttermilk to Lionhead Ridge to take down the weather station for the season. The snowpack was fully saturated and sloppy at lower elevations. By 8000 ft there was a firm crust with a couple inches of wet snow above it around noon. Winds were breezy at ridgetops, keeping the snowpack a bit cooler (but still getting wet). Ominous clouds moved in around 12:30 pm. We quickly left before getting rained on. 

We saw no signs of recent avalanches.

Rode up cottonwood creek on the west side of the crazies. Saw several recent wet loose slides on southern aspects as well as some isolated slides on north/west aspects. Only saw one larger slide that had a wide crown(500ft) D2 on an east aspect.  All slides were breaking in the upper 40cm in new/old snow.

Dug a pit north east aspect HS270cm ECTN24 @40cm down from surface. Melt freeze down 70cm might start reacting when water penetrates through upper snow pack, dry snow in upper 60cm but becoming more moist on solars.

Driving home from Bridger Bowl I spotted a number of wet loose avalanches in Argentina bowl. It was 1:30 PM when I saw them and the sun was still blazing. I would expect there was more activity as the afternoon progressed.

Unintentionally triggered a large cornice collapse on the south face of the Sphinx.  I should have expected it, but it was certainly touchier than I was anticipating. Intermittent wind gusts kept upper elevations cooler and we found somewhat cold snow up high. At treeline and below it was hot and crusty! Photos show cornice before and after. 

From email: "Had propagation on 1.5mm rounding facets below the mid-March, 1/2cm thick and knife hard MF crust. This location is always shallow and has a poor structure, but I was surprised to get propagation.

Further up valley on a west aspect, HS 130, 1 of 2 pits had ECTP28 on the basal facets. Pretty wild to still be getting propagation in mid April. 

Winds were light out of the south, gusting to strong at ridgetops out of the west with active snow transport. No wet loose activity seen today, but several old wet loose avalanches on Climax from the last warm up. "