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Avalanche Forecast

Archived

Feb 18th, 2023–Feb 19th, 2023

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Northwest Coastal, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Ningunsaw.

Carefully assess new snow amounts and avoid avalanche terrain if more than 25cm of new snow is found. There is some uncertainty in how far inland this storm will push.

Confidence

High

Avalanche Summary

No notable avalanches were reported on Friday.

We expect that a natural storm slab cycle will take place starting early Sunday morning.

Snowpack Summary

New storm and wind slabs will form throughout Saturday night and Sunday. This will also add to the already large cornices.

Up to 30cm of previous storm snow sits over a layer of small surface hoar, facets and wind effected surfaces. Below treeline a new crust could exist up to 1000m.

A layer of facets and a crust from late January can be found down 100 to 200cm. Below this layer the snowpack is generally well settled and right side up.

Weather Summary

Saturday Night

Stormy with up to 35cm of new snow expected. Moderate to strong westerly winds and a high of -4 at 1500m.

Sunday

Stormy with up to 10cm of new snow expected. Moderate to strong westerly winds and a high of -4 at 1500m.

Monday

Stormy with up to 15cm of new snow expected. Light to moderate southerly winds and a high of -5 at 1500m.

Tuesday

A mix of sun and cloud with no new snow expected. Moderate northerly wind and a high of -12 at 1500m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Be careful to keep storm day fever from luring you out into bigger terrain features.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid exposure to slopes that have cornices overhead.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.