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Avalanche Forecast

Archived

Jan 20th, 2014–Jan 21st, 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.

The sun is expected to shine for most of the day today with warmer temperatures up high. Watch your exposure to overhead cornice hazard and large slopes on solar aspects while the sun is shining on them.

Weather Forecast

Ridge of high pressure will dominate the weather pattern for the next few days with no significant precipitation forecast. Mix of sun and cloud today, valley fog and an inversion with milder temperatures up high with winds remaining light. Light snow expected on Wednesday in the interior.

Snowpack Summary

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