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Archived

Avalanche Forecast

Dec 25th, 2018–Dec 26th, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Merry Christmas! Persistent weak layers require a conservative mind set when choosing where to skin up and ski down.

Weather Forecast

A mix of sun and cloud with a trace of snow and alpine high of -10C and light winds. Continued cool with light winds and isolated flurries through Thursday. Freezing level should remain at valley bottom.

Snowpack Summary

60cm of settled storm snow from last week. Pockets of wind slab may be lingering in lee features and cross loads in the alpine and open tree line areas. The Dec 9 and Nov 21 persistent weak layers are down ~100-120cm and still producing Hard and Sudden test results.

Avalanche Summary

Several size 2.5 - 3 natural avalanches observed on Dec 23 mainly from extreme terrain. A widespread avalanche cycle, sz 2 - 3.5 occurred Friday morning with the strong/extreme SW winds. A large sz 3.5 avalanche from Grizzly Peak / Dispatchers Bowl that traveled over 2km from the alpine to valley bottom buried 80m of the Connaught Creek skin track.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

The Dec 9 and Nov 21 persistent weak layers are down ~100-120cm and consists of surface hoar, facets, or a sun crust. Sudden test results are being seen on this layer. Human triggered avalanches on these layers remains possible.
Dig down to find and test weak layers before committing to a line.Watch for whumphing, hollow sounds and shooting cracks.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1.5 - 3

Wind Slabs

We have minimal observations from alpine terrain and have concerns of lingering pockets of wind slab; especially in immediate lee features below ridge crests and on cross-loaded slopes. Use caution and tread carefully entering new terrain.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2