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Avalanche Forecast

Archived

Mar 7th, 2021–Mar 8th, 2021

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

Regions

South Coast Inland.

Sunny skies and rising temperatures may initiate wet loose activity on lower elevation and/or sun-exposed slopes. Steer clear of cornices and wind-drifted areas as they have the potential to produce large avalanches. 

Confidence

Moderate - Uncertainty is due to how quickly the snowpack will recover and gain strength. Uncertainty is due to how the snowpack will react to the forecast weather.

Weather Forecast

Dry conditions for the next few days

Sunday night: Partly cloudy, isolated flurries with trace accumulations, light southwest winds, freezing level dropping to valley bottom.

Monday: Mainly sunny, light south winds, freezing level rising to 1400 m and dropping to valley bottom overnight.

Tuesday: Mix of sun and cloud, light southwest winds, freezing level rising to 1300 m and dropping to valley bottom overnight.

Wednesday: Partly cloudy, scattered flurries with trace accumulations, moderate northwest winds, freezing level rising to 1000 m. 

Avalanche Summary

In the north of the region, reports indicate that an avalanche cycle occurred during the storm on Friday, where large (size 2.5) avalanches released naturally on a variety of aspects and elevations. Check out these MIN reports (here and here) from slopes near Chief Pascall. 

Last week, observers near Duffey Lake reported a large (size 2.5) avalanche on a north aspect at 1750 m that was thought to have released 1 m deep on a persistent weak layer. Additionally, a size 1.5 skier accidental was reported on a northwest aspect in the alpine, which was also near Duffey Lake and also thought to have failed on a thin persistent weak layer of facets. 

In the south of the region, there have been numerous reports of large (size 2-3) natural glide slab avalanches over the past week. Glide slabs are most likely in areas of smooth ground cover such as rock slabs and can be large, involving the full depth of the snowpack. Carefully consider your access/egress routes where they cross under large paths. 

Snowpack Summary

In the north of the region, 30-50 cm of new snow over the weekend has been redistributed by strong south winds into wind slabs on leeward slopes that may be likely to trigger. Massive cornices exist on ridgelines, which can act as triggers on slopes below.  

Deeper in the snowpack, a persistent weak layer of facets can be found from mid-February on north aspects near treeline that demonstrated reactivity where it separates wind-stiffened snow above and below. There is some lingering uncertainty about whether this problem remains reactive in isolated areas. The lower snowpack is generally well settled and strong.

The south of the region received only a trace of new snow over the weekend with moderate wind. The danger ratings are Moderate, Low, Low, with a concern for small wind slabs. The snowpack is generally well consolidated with no concerns of buried weak layers but recent notable glide avalanche activity.

Terrain and Travel

  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Cornice failure may trigger large avalanches.
  • As surface loses cohesion due to melting, loose wet avalanches become common in steeper terrain.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.