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Archived

Avalanche Forecast

Jan 11th, 2019–Jan 12th, 2019
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
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
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

Regions: Glacier.

Watch for an increasing avalanche danger this weekend with forecast freezing levels rising above mountain top.

Weather Forecast

Mainly cloudy today with light winds and an alpine high of -4C. The freezing level should rise to 1200m later today and is forecast to rise to 2900m for the weekend with an alpine high up to +5C forecast for Sunday. Watch for an increasing avalanche danger.

Snowpack Summary

Nearly 50cm of snow has fallen in the past 5 days. On southerly aspects, NE winds yesterday will have reverse loaded lees creating deeper pockets of soft slab. In exposed alpine areas and a ridge crest it will have buried old windslabs. The Jan 2 freezing rain crust is down ~90cm. The Nov 21st interface is now 1-2m in deep

Avalanche Summary

Yesterday skier remote triggered size 1 avalanche at 2100m on Puff Daddy from 10m distance, skier triggered slide in the Christmas Trees size 1, skier remote triggered size 1 slide 1700m up NRC. 20 avalanches observed in the highway corridor mostly in the size 2-2.5 range. Wed, skier accidental size 3.5 from the top of Camp West avalanche path.

Confidence

Freezing levels are uncertain

Avalanche Problems

Storm Slabs

Recent snowfall combined with mild temps, has created soft storm slabs in many areas. Storm slabs have been reactive and easily triggered by skiers. Be especially cautious in alpine areas, where it has buried windslabs.
Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

The recent size 3.5 skier triggered aval in Camp West path highlights that in some areas persistent slabs may be reactive. The problem likely woke up with rapid wind loading and significant new snow in January and was triggerable in a shallow area.
Avoid steep convexities or areas with a thin or variable snowpack.Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2.5 - 4