24-25

Surface hoar stripe in snowpit near Cooke. 

Photo: GNFAC

We skied near Lulu Pass and dug a pit on a northeast facing slope at 9,500'. There was 6-8" of low density new snow on top of a thick layer of surface hoar (10-16mm, photos attached). Photo: GNFAC

Summited Mt. Blackmore 12/10. High wind and heavy wind loading were found, but minimal signs of instability were found within the wind-loaded areas. Some localized cracking and collapsing were observed throughout the boot pack but had minimal propagation. Before the climb, we performed an ECT on a wind loaded slope and found inconclusive results with ECTX. 

We skied near Lulu Pass and dug a pit on a northeast facing slope at 9,500'. There was 6-8" of low density new snow on top of a thick layer of surface hoar (10-16mm, photos attached). Snow depth was 90cm. There was a layer of small facets directly below the surface hoar, and below that the snowpack mostly had rounded grains and showed little signs of weakness. We had an ECTN12 on the surface hoar layer. While skiing I saw some 5 foot long cracks across the snow surface on a wind-affected convexity.

I'm not sure how widespread the buried surface hoar is, but this will be our primary interface of concern when we get more snow. We did not find surface hoar on south and west facing terrain in this area, but there was a crust with small facets below it buried 6" deep. Right now there is not quite enough recent new snow to create widespread instability. I do suspect a slab of drifted snow or a wind stiffened slab could propagate easily, especially if it lies on buried surface hoar.

Light snow fell most of the day with maybe an inch of accumulation all day. Wind was light and temps were single digits to low teens. Some moderate gusts in the afternoon, and winds increasing in town this evening. 

We rode out of the Buttermilk Trailhead to the old Ski Hill at Lionhead with Gallatin County SAR, Fremont County SAR, and local snowmobile guide from West Yellowstone for our annual West Yellowstone Avalanche Fundamentals class.

It snowed lightly all day without much accumulation (maybe an inch). Winds were stronger than I anticipated, but weren't moving much snow at 8000.' I suspect there was a bit more transport at higher elevations along the ridgeline, but there just isn't much soft snow available for transport. Isolated instability is tied to wind loading. At the Ski Hill breakover, we dug 40 people worth of snow pits. In a couple of them, there was just enough wind loading to get propagating results (ECT16-ECTP24) on basal weak layers. 

Recently, buried surface hoar and near surface facets didn't have enough new snow on it to cause problems, but it was preserved under 1-2" of snow. 

Drifted snow at Bradley Meadow

Photo: GNFAC

Snow profile N facing by Texas Meadow

Went north of Bridger Bowl towards Texas Meadows. 

Winds - blowing strong at the ridge and below about 7400 feet below most of the avalanche terrain (Top of the Alpine Lift down to the BB base area). Winds not doing much around the elevation of the Bridger Lift and the Ramp.

Snow - Just creamy, supportable skiing. South aspects have a supportable melt-freeze crust keeping you off the ground. North aspect have supportable snow. More wind affected areas had alternating scoured snow and wind-deposited snow, but skied pretty well. 

Avalanche issues - All tied to the wind. Fresh drifts were easy to find where the wind was blowing. Avoid wind effect and ski/ride soft snow and you avoid avalanches. The old snow surface faceted but not too badly compared to other areas. I suspect you could find areas where the old snow surface was more faceted and weaker, but they seem isolated.