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Avalanche Forecast

Archived

Jan 21st, 2014–Jan 22nd, 2014

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, 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

Glacier.

If the sun comes out watch your exposure to the overhead cornice hazard.

Weather Forecast

Ridge of high pressure will maintain its stranglehold over the interior despite a slight disturbance tomorrow bringing light snow and overcast skies. Mostly cloudy today with light south westerly winds and a temperature inversion. This pulse will pass by Thursday returning clear and dry conditions for the foreseeable future.

Snowpack Summary

Upper 20cm is wind affected at tree line and alpine elevations on all aspects over a well settled mid pack. The Nov. surface hoar has spotty distribution and down 180cm. The basal layers are more facetted and generally weaker than the rest of the snowpack. Expect a sun crust on steep south aspects as well as a rain crust below 1300m

Avalanche Summary

No new avalanche activity yesterday.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.