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Archived

Avalanche Forecast

Dec 26th, 2015–Dec 27th, 2015
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Little Yoho.

A bit of wind in the last 24 hours has been responsible for some wind effect and slab formation in the alpine.

Weather Forecast

A bit of moisture has made it into the region today bringing mainly cloudy skies with a trace of precip through Monday and creating a mild temperature inversion. Treeline temperatures will stay between -10 and -15. Moderate westerly winds should back off before shifting to the North as a high pressure system becomes more established on Tuesday. 

Snowpack Summary

A well settled snowpack with few weaknesses exists throughout the region. Some small isolated wind slabs exist on leeward slopes in the high alpine. Below 2000m the Dec 3 layer of surface hoar remains visible and produces hard, planar test results in some areas. This weakness is strengthening. Thin snow pack areas are beginning to facet out.

Avalanche Summary

One new natural slab avalanche was observed Friday on a steep N facing hanging snowfield on White Pyramid, 15-20m wide and about 1m deep, possibly cornice triggered. Some sluffing has been observed in really steep terrain due to the increasing winds moving the low density surface snow .

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Some thin, isolated winds slabs are beginning to form in leeward areas near ridge crests as the winds increase. Keep an eye out for these spots when entering steep terrain.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Use safe ski cutting techniques before entering ski run.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The slab above the Dec 3 surface hoar layer has not been very reactive recently. Snow pack tests produce shears in the moderate to hard range. This is mostly a concern in areas near the divide with a deeper snowpack and more snow over the weakness.

  • Dig down to find and test weak layers before committing to a line.
  • Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.

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

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 1 - 2