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Avalanche Forecast

Archived

Apr 2nd, 2021–Apr 3rd, 2021

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

Regions

Little Yoho.

Quality skiing/riding still available on higher elevation, polar aspects.

The lower elevation snowpack will deteriorate with prolonged solar radiation and warming temps.

Weather Forecast

Saturday will have a mix of sun and cloud, winds 20-60km/hr from the South West and a freezing level up to 1900m as the valley bottom reaches a high of +12. A system pushes into the region on Saturday night bringing 10-15cm of snow and gradually decreasing winds over the day on Sunday.

Snowpack Summary

Crusts exist up to ~1600m on all aspects and higher on solar aspects. Strong Southerly winds have formed wind slab at tree line and above. The March 19 interface is down 20-50cm and consists of crust on solar aspects and facets on north aspects. Basal facets exist in shallow areas east of the divide.

Avalanche Summary

Several cornice failures over the last week up to size 2.5, some of which have pulled small slabs from the slopes below.

Confidence

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.

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.

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.