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Avalanche Forecast

Archived

Feb 13th, 2021–Feb 14th, 2021

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

Regions

Little Yoho.

New wind slabs are the main concern in Little Yoho, and cornices have been seen to fail over the last few days.

Weather Forecast

After another -25 to -30C morning, temperatures will rise again on Sunday with highs at treeline of between -12 to -16 C. Skies will remain mainly clear. Alpine winds will decrease to light and will switch to a more Westerly flow. We will see a gradual increase in temperature over the next week.

Snowpack Summary

Winds have created small slabs in lee areas of the alpine, and wind effect in open alpine and treeline areas. The surface snow is facetting quickly and beginning to sluff more easily in steep terrain. A facet layer from Jan 27th is present at treeline and in the alpine down 30-40cm. On steep south this layer may consist of a thin sun crust as well.

Avalanche Summary

Increased winds saw some loose dry activity in steep alpine terrain on Mt. Stephen. Cornice failures have been observed over the past few days, which have pulled small wind slabs below. A size 2to 2.5 on Mt. Carnarvon was reported to have occurred over the last 24 hours, but it is unsure what the trigger was.

Confidence

Due to the number and quality of field observations

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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.