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Avalanche Forecast

Archived

Jan 2nd, 2025–Jan 3rd, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Keep a heads up for lurking windslab around ridgetop lee features, especially in unsupported or extreme terrain.

Confidence

Moderate

Avalanche Summary

We have observed a few natural avalanches up to size 2 this week. They occurred in the steep terrain east of Rogers Pass.

Reports on rider triggered sluffing in steep terrain have continued throughout the week.

There are also some great MIN reports that show rider controlled windslabs in steep terrain.

Snowpack Summary

Around 60cm of new snow has fallen over the past week. This new snow has been redistributed by moderate wind which has created pockets of soft slabs in wind prone areas. There is a isolated sun crust buried ~15cm on steep S aspects.

The snowpack is strong with a well settled mid-pack. An interface down 90-120 has been unreactive for weeks. It consists of surface hoar in sheltered locations, and a sun crust on solar aspects.

Weather Summary

Cool temps and light flurries persist Friday as the high pressure system dominates the weather for another day

Tonight Cloudy w/flurries. Trace precip, Alp Low: -10, Ridge wind: SE 15. Freezing level (FZL) at valley bottom.

Fri Cloudy w/flurries. Trace precip. Alp High: -5. Wind: SE 15. FZL 1000m.

Sat Flurries 5cm, Alp high -6 °C. Wind: SW 15-25. FZL 1400m

Sun Cloudy w/ flurries. Trace precip. Wind: SW 10-20. FZL 700m

Terrain and Travel Advice

  • Be especially cautious as you transition into wind-affected terrain.
  • Use appropriate sluff management techniques.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.