Quick report
- Aspect
- North
- Red Flags
- Heavy Snowfall, Cracking, Collapsing, Poor Snowpack Structure
- Elevation
- 3292 m
- Slope Angle
- 25°
- Red Flags Comment
- <p>We noted a few storm snow point releases out of cliffy alpine start zones, but nothing slabby. We had a couple localized collapses breaking track and one big collapse right at a shrubby treeline slope inflection point where things started getting steeper. An area ~20-30' collapsed with visible shooting cracks at the edges. If it were on a steep slope, it would have slid (see pic below). We didn't encounter any wind slabs, but saw some wind patterns in snow up higher in the alpine of Middle Cirque and Talking Mtn. Also did not see any active wind transport...</p>
Pic 1) Cracking near treeline where we had a large collapse
Pic 2) Looking up into Middle Cirque and TM where more wind impacts were observable
Pic 3) Fabulous Day!
Snowpack
- Instability Comment
- <p>Although the new snow is not reactive right now, a release of new snow could step down in an area like the one where we had a collapse. This new snow might still slab up iwith the sun/warmth we had, and it is on top of 1) facets and 2) a decent crust that seemed like a good bed surface. So, something to be aware of.</p> <p>Facets abound in our snow pack and are complicated to predict with our set up of multiple crusts on the north aspects. Nothing of note slid with this cycle that we observed, but it wasn't a huge load and there was enough collapsing that I'd tread with caution on these aspects. The bottom line is it's not a trustworthy snowpack structure. With any rapid warming and consolidation of new snow on top, the facets that formed on the old snow surface before this storm could be our next weak layer.</p>
The snow was quite good with 8-12" new snow. The local variability in new snow depth was interesting, but the snow was largely not wind affected. It just seems like there was enough wind during the snow to fill in low sheltered spots a little more than short scale convexities without causing the snow to slab up. It was really fun to ski, but a bit slow in areas where you would dip into older faceted snow. There were also some areas where you could feel hard crusts underneath. We were probing 80-120+ cm in a north sheltered aspect at 10,600'. We could feel two crusts starting, the first down ~1.5' and another down around 2' below the surface. We found a lof of facets on top of the first crust and our pole pokes felt like there were more facets between the crusts and down at the bottom of the snowpack. Complicated snowpack.