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Archived

Avalanche Forecast

Dec 29th, 2016–Dec 30th, 2016
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Moderate to heavy snowfall expected today and tonight!  Limit your overhead exposure to avalanche terrain & be mindful of groups below you.

Weather Forecast

Today a trough of low pressure will bring 15-25cms of snow and 20kph SW winds at ridgetop to Roger's Pass.  Friday a ridge of high pressure will set up bringing drier conditions. Another pulse of moisture could bring 5cm of new snow Saturday before the arctic high pressure settles in and we experience dry, cold conditions through next week.

Snowpack Summary

Within the last 24hrs we have received ~30cm of new snow and strong S winds that are building a reactive wind slab in the Alpine and a new storm slab at treeline and below. In recent profiles numerous failures were observed, possibly on surface hoar in the top 70 cms and this storm snow is settling into a stiffer slab.

Avalanche Summary

Yesterday skiers reported triggerable windslabs on a SW aspect at 2100m on McGill, and there were several size 2 and a size 3 natural avalanche from steep paths east of Rogers Pass. On Monday, a size 2 skier-triggered avalanche from steep, shallow, unsupported terrain carried a person over a large cliff and resulted in a rescue.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

Up to 30cm of snow fell in the last 24hrs at treeline with another 15-25 expected today & tonight. This new slab has buried a spotty surface hoar layer, that could be lurking. Expect this new load to take some time to stabilize.
Carefully evaluate terrain features by digging and testing on adjacent, safe slopes. Ski short pitches and regroup in safe spots.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Wind Slabs

Up to 30cm of snow fell in the last 24hrs at treeline with another 15-25 expected today & tonight. This new snow combined with mod gusting strong S winds has built a fresh reactive windslab in the Alpine that has potential to propagate widely.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution in lee areas. Recent wind loading have created wind slabs.

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

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 3