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Avalanche Forecast

Archived

Mar 27th, 2020–Mar 30th, 2020

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

Regions

Yukon.

Lack of field data limits our confidence in this forecast. New snow combined with southwest wind Thursday into Friday has developed fresh wind slabs. This is the last forecast for the season.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

FRIDAY Night: Cloudy with isolated flurries, moderate northwest wind, alpine high around -20 C.

SATURDAY: Mainly cloudy with isolated flurries, light to moderate west wind, alpine high around -15 C.

SUNDAY: Mainly cloudy, light to moderate northeast wind, alpine high around -14 C.

MONDAY: Mainly cloudy with sunny periods, light to moderate northeast wind, alpine high around -18 C.

Avalanche Summary

No new avalanches have been reported

Looking forward, avalanche problems will likely remain limited to small wind slabs in the lee of exposed features.

Snowpack Summary

Up to 10 cm of new snow fell Thursday night with moderate southwest winds, forming new wind slabs in lee terrain. This new snow adds to the equivalent amount from last week and likely sits on a variety hard surfaces which may include old wind affected snow or melt freeze crust. The lower snowpack is well settled with little concern at this time. 

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.

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.