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Avalanche Forecast

Archived

Feb 20th, 2019–Feb 21st, 2019

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

Glacier.

Great conditions considering the lack of recent snow. Cold temps are promoting snow surface faceting, which is maintaining ski quality.Pockets of wind slab and loose dry avalanches are the main concern, especially in steep exposed terrain.

Weather Forecast

Sun with periods of cloud for the day with a small chance of convective flurries this afternoon. Remaining cool with an alpine high of -11 and light NE ridge top winds. More of the same until the weekend when a weak low pressure systems arrives bringing a meager 5-10cm.

Snowpack Summary

5cm in the past 24hrs brings the weekly total to 20cm which covers old wind slabs in the alpine and exposed areas of tree line. In sheltered areas at tree line and below the storm snow is covering surface hoar and near surface facets. The mid and lower snowpack is well settled and strong.

Avalanche Summary

Several natural avalanches up to size 2 from Mt. Tupper and Mt. MacDonald yesterday along the highway corridor. Reports of numerous loose dry avalanches up to size 1.5 on solar aspects up the Connaught drainage and a size 2.5 cornice failure from Cheops North 5. Wind slab, soft slab and loose dry snow is still susceptible to human triggering.

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 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.