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Avalanche Forecast

Archived

Nov 29th, 2021–Nov 30th, 2021

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

Regions

Yukon.

Keep your guard up as the wind will shift to the east and build fresh wind slabs in the alpine. Wind slabs are particularly reactive during their formation.

Confidence

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

Weather Forecast

Strong outflow winds will push drier and colder air across White Pass as the Arctic front finally moves further south. Flurries will be on and off, creating blowing snow conditions.

MONDAY NIGHT: Cloudy with flurries / Strong, easterly winds / Low of -14

TUESDAY: Cloudy with flurries 3-5 cm / Strong, easterly winds / High of -10

WEDNESDAY: Light snow 3-5 cm / Strong, southwesterly winds / High of -8

THURSDAY: Light snow 3-5 cm / Strong, southwesterly winds / High of -10

Avalanche Summary

Large natural avalanches (size 2 and 2.5) were released recently on alpine lee features. Snowmobilers also triggered size 2 wind slab avalanches (size 2) near Fraser. Lots of whumpfing and cracking have been notified across the region and are most likely to be associated with early-season shallow snowpack

If you go out in the mountains, please post your observations and/or photos to the Mountain Information Network!

Snowpack Summary

On most aspects above treeline, wind-affected, wind-pressed, and wind slabs are present due to continued strong southwesterly winds. Little information is available about a weak layer of facets over a crust reported lower in the snowpack. Snow depths are approximately 80 cm at treeline and 100-120 in the alpine.

Terrain and Travel

  • Avoid freshly wind loaded terrain features.
  • Wind slabs are most reactive during their formation.
  • Be especially cautious near rock outcroppings, on steep convexities and anywhere the snowpack feels thinner than average.

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.