Avalanche Forecast

Issued: Jan 2nd, 2021 3:00PM

The alpine rating is high, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Wind Slabs, Deep Persistent Slabs and Cornices.

Avalanche Canada mkoppang, Avalanche Canada

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New snow, warm temps and strong SW winds will likely initiate an avalanche cycle on Sunday. A good day to make conservative terrain choices. 

Summary

Confidence

Moderate -

Weather Forecast

Our weather stations are currently down due to a satellite issue.

Most weather models seem to agree that we should see about 20-25cm of snow beginning overnight and into the morning with strong SW winds. Temperatures will be around -5C and then begin cooling again as the storm leaves the region late in the day on Sunday. New snow, winds and warm temps are ideal conditions for avalanche formation. 

Avalanche Summary

One audible avalanche likely a cornice collapse off of Snow Peak. An additional sz 2 avalanche on the back side of Lawrence Grassi was observed on a flight to the Burstall Pass region. Visibility was limited for most of the day and as a result, not many new avalanches were observed.

Snowpack Summary

Pronounced windslab development in the region especially in the alpine and into treeline. Our Snowpack mainly consist of generations of windslabs overlying a relatively strong mid pack with the Basal November rain crust at the lower elevations. For december it has been a fairly stable snowpack with the windslabs in the upper snowpack as the primary concern but that is all likely to change with the incoming storm. As we did pre Christmas, we are expecting to see avalanches in the upper snowpack and the possibility of the basal facets and November crust becoming overloaded and failing triggering large avalanches. Forecasters were getting cracking in open areas around burstall pass. 

Terrain and Travel

  • Pay attention to the wind, once it starts to blow fresh sensitive wind slabs are likely to form.
  • Avoid areas where the snow feels stiff and/or slabby.
  • Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.

Problems

Wind Slabs

An icon showing Wind Slabs

Forecasted new snow and winds will quicly build new reactive windslabs in alpine and treeline areas 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

1.5 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

This layer may reawaken with the new load anticipated over the 24hrs. 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 3.5

Cornices

An icon showing Cornices

Fresh cornices will be building on Sunday. 

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine.

Likelihood

Likely

Expected Size

1.5 - 2.5

Valid until: Jan 3rd, 2021 3:00PM