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Avalanche Forecast

Archived

Jan 15th, 2015–Jan 16th, 2015

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Sea To Sky.

Incoming precipitation with strong S-SW winds will create wind-slabs at treeline and above on existing crusts. Surface hoar has formed in protected locations. Careful terrain evaluation will be important during this storm cycle

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

A pacific frontal system moves through Southern BC today bringing 10 to 15cm of snow at upper elevations and rain in the valleys. Friday and Saturday will give us flurries but not much precipitation. Sunday should give another 20cm of snow at upper elevations. Parts of the forecast area will see freezing levels rise to 2000m as the system moves through to the east.

Avalanche Summary

No report of avalanche activity from yesterday.

Snowpack Summary

New snow accompanied by strong South winds is being deposited on a surface crust for most of the snowpack above 1500 metres. Breakable crust below 1500 metres. Surface Hoar to ridge tops on protected North aspects.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.