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Archived

Avalanche Forecast

Jan 3rd, 2018–Jan 4th, 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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Changing slab condition over the Dec 15th surface hoar persistent weak layer is the chief concern right now. Take time to evaluate the snowpack before committing to your line.

Weather Forecast

Cloudy with sunny periods and no precipitation today. Alpine high of -2C with light winds and a freezing level of 1800m. A warming trend continues into the weekend with flurries expected on Friday into Saturday.

Snowpack Summary

The Dec 15th PWL (most prominent at TL) is the main layer of concern, in many areas a slab has yet to form over it though. We were able to observed some failures of this layer to size 0.5 in one location and "cracking" giving the snowpack a rippled effect in other sites. Steeper solar aspects will have a sun crust after yesterday's warmth.

Avalanche Summary

Two natural size 1.5 slabs in the highway corridor and Frequent Flyer made it down across the summer trail yesterday size 1.5-2. Part of the north face of Swiss Peak also came out size 3 in the last 48hrs. Skier triggered size 1 remote from 10m away yesterday in the west end of the park.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

The December 15 surface hoar layer is widespread around treeline and buried 60cm. Cold temps have kept the slab from settling and gaining cohesion, limiting natural and skier triggered avalanches so far.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution above cliffs where small avalanches may have severe consequences.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Loose Dry

We may see a natural loose dry cycle on steep solar aspects if the sun does come out today.
Use caution above cliffs where small avalanches may have severe consequences.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2