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Avalanche Forecast

Archived

Dec 10th, 2023–Dec 11th, 2023

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Assess open slopes for wind slab before committing to your line.

Winds have varied in direction, wind slab could be found on all aspects.

Confidence

Moderate

Avalanche Summary

Small pockets of wind slab were reported on Sunday. Take a look at this great MIN describing cross loading at Fraser Chutes.

Snowpack Summary

Wind direction has been variable in the past couple days, wind slab could be found on all aspects as a result. In Non-wind effected terrain there is around 30 cm of soft snow.

A crusts can be found down around 60 cm on terrain below 1200 m, on wind scoured slopes it could be on the surface. In General the snow above this crust is well bonded to it.

The snowpack is now above threshold for avalanches on smooth slopes at treeline with an average snowpack depth of 75 cm. In wind loaded areas in the alpine the snowpack depth is approaching 2 m.

Weather Summary

Sunday Night

Cloudy with up to 5 cm of new snow expected, south alpine wind 30 to 60 km/h, treeline temperature -8°C.

Monday

Cloudy with up to 5 cm of new snow expected, south alpine wind 50 to 70 km/h, treeline temperature -2°C.

Tuesday

Mostly cloudy with up to 10 cm of new snow expected, south alpine wind 30 to 70 km/h, treeline temperature -1°C.

Wednesday

Cloudy with up to 15 cm of new snow expected, south alpine wind 40 to 60 km/h, treeline temperature -6°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be carefull around freshly wind loaded features.
  • Use ridges or ribs to avoid areas of wind loaded snow.

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.