Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Regions
Glacier.
The storm slab will be most reactive at ridgetop where exposed to wind. Avoid exposure to other groups above or below you.
Weather Forecast
A ridge of high pressure will build today over Roger's Pass. Expect cloudy skies with some sunny breaks throughout the day today. No new snow is forecast and the alpine high will be -10 with the freezing level staying at valley bottom. Winds will be generally light from the Northwest. The high pressure will dominate the weather through the week
Snowpack Summary
25cm of recent snow sits on the previous settled storm snow. The November 26/23rd crust layers are easily identified down 65-80cm. Recent stability tests show a generally good bond between the Nov 26 and the dry snow above. The lower snowpack is still moist but is starting to dry out with cooler temperatures.
Avalanche Summary
The storm from Friday and Saturday brought heavy snowfall and strong winds at ridgetop. This triggered a natural avalanche cycle to size 3 with some paths running to valley bottom. Friday the avalanche path 'Frequent Flyer' ran during the day, burying the skintrack 7-10m wide. A good report here.
Confidence
Problems
Storm Slabs
Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.