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Avalanche Forecast

Archived

Mar 31st, 2022–Apr 1st, 2022

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

Regions

Yukon.

Carefully assess the wind slab hazard as you gain elevation. Strong winds and blowing snow have been observed in the region.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Thursday night: Flurries bringing up to 5 cm of new snow with light to moderate southwest winds. Low of -5 at 1100 m.

Friday: Cloudy with around 5 cm of new snow expected. Light to moderate southwest winds. Freezing level rising to 1000 m.

Saturday: Cloudy with light flurries bringing trace amounts of new snow. moderate to strong southwest winds in the morning becoming light in the afternoon. windsHigh of -2 at 1100 m.

Sunday: stormy with up to 10cm of new snow with light to moderate south winds. High of -2 at 1100 m.

Avalanche Summary

On Wednesday our field team observed natural dry loose avalanches on all aspects to size 1.5. While in the field they also observed wind transport and new wind slab formation.

Snowpack Summary

Wind slab will likely be found on north and east aspects in exposed terrain. A crust can be found below 1200 m and on all elevations on solar aspects. This crust will likely become moist at lower elevations as the freezing level rises.

Large cornices have been observed in the region.

The middle of the snowpack is reported to be strong and well settled while the lower snowpack near the ground is reported to be faceted. 

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.