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Avalanche Forecast

Archived

Nov 28th, 2020–Nov 29th, 2020

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

Regions

Yukon.

Poor visibility & HIGH hazard should make avalanche problems obvious and avoiding avalanche terrain easy. Monday and Tuesday will be the challenging days. As you return to avalanche terrain test small slopes and look around before considering riding slopes with consequence.

Confidence

High - We are confident the likelihood of avalanche will increase with the arrival of the forecast weather.

Weather Forecast

SATURDAY NIGHT: Saturday's storm begins to ease with winds shifting to the southwest in the 50 - 60 km/hr range and still snowing.

SUNDAY: Continued stormy conditions with southwest 40 km/hr winds, temperatures around -5 - -10 C, and storm snow accumulations of 15 to 25 cm, much deeper with wind deposits.

MONDAY: Wind starts to diminish, still from the southwest, light snow with less than 5 cm accumulating, temperatures cooling to around -10 C.

TUESDAY: The next storm is forecast to arrive. It's looking warmer, windier, and juicier than this weekend's weather. Hopefully temps will stay below freezing ... stay tuned for updates!

Avalanche Summary

No avalanches reported that I'm aware of but honestly, the rear-view mirror of past avalanches is more than likely old news. The new news is going to be all about increasing winds and incoming snow. Expect hard and soft wind slabs to be developing Saturday. My guess is they'll have become rider triggerable late Saturday so check the MIN for Saturday's observations

Snowpack Summary

The winter snowpack is growing, and settling. Winds are moving it around which is helping fill in creeks and gullies at the expense of windward slopes and terrain bulges being stripped. Anywhere from zero to 150 cm. In the trees at Fraser our weather station is showing 75 cm. Winds are increasing so softer surface snow will be re-distributed and in some places those crusts down 15 will become the surface.

With Saturday's storm, soft and hard slabs will become the snowpack feature to note.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Avoid exposure to slopes that have cornices overhead.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.