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Avalanche Forecast

Archived

Dec 6th, 2018–Dec 7th, 2018

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
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.

Regions

Glacier.

Always exercise safe back country travel techniques even when the hazard is low. Many early season hazards exist at all elevations.

Weather Forecast

Sunny skies, cold temperatures and light winds are forecasted for today. The alpine may reach -8 degrees and the freezing level could rise to 600m. We may see an inversion settle in on Friday evening and the next storm is forecasted to reach Rogers Pass on Monday morning. Models are forecasting 20 to 30cm of new snow and the FL rising to 1000m.

Snowpack Summary

Surface hoar is growing in sheltered areas while a thin sun crust exists on steep solar aspects. 25-40 cm of storm snow overlies the Nov 21 SH, this layer has been observed up to 15mm and sits on a sun crust on steep solar aspects. The mid-pack is well settled and the Oct 26th crust sits on or near the ground at treeline and above.

Avalanche Summary

No new natural avalanches have been observed in the Highway Corridor or reported from the Backcountry in the last three days.

Confidence

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.