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Avalanche Forecast

Archived

Jan 28th, 2022–Jan 29th, 2022

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

Regions

Yukon.

Avoid wind loaded terrain at all elevations. Fresh wind slabs will continue to form throughout the day on Saturday.

Confidence

Moderate -

Weather Forecast

Friday night: moderate to strong south winds with 5 to 15cm of snow throughout the day. Greatest snowfall in the White Pass area. Low of -3 at 1100m.

SATURDAY: Stormy weather continues with 10 to 20cm in the White Pass area. Moderate wind from the south. High of -2 at 1100m.

Sunday: clearing throughout the day, snow ending in the early afternoon. Winds becoming light. High of -12 at 1100m.

Monday: clear skies with a high of -20 at 1100m. Moderate north wind.

Avalanche Summary

We suspect new rider triggerable wind slabs formed throughout the day on Friday.

On Wednesday our field team observed a size 2 natural wind slab avalanche on a southeast aspect at 1500m.

A few small (size 1-1.5) wind slab avalanches were reported on Tuesday, including a skier controlled wind slab from the AvCan field team. 

Snowpack Summary

Open terrain will continue to experience steady blowing snow . This will further reshape the already variable snow surface with a mix of fresh soft wind slabs, old hard wind slabs, sastrugi, and scoured surfaces. Pockets of soft snow may be found in sheltered trees. Some thin crusts may be found near the surface on south-facing slopes and at lower elevations further inland where there has been recent snowmelt. There are currently no concerns about the lower snowpack, although areas with thin snowpacks have weak faceted snow near the ground.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Wind slabs are most reactive during their formation.

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.