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Avalanche Forecast

Archived

Jan 30th, 2019–Jan 31st, 2019

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

Regions

Glacier.

Moderate= Human triggered avalanches possible!

Weather Forecast

Mainly cloudy today with a chance of flurries, the alpine may reach -6, and the wind will be light out of the SW. Tomorrow: 7cm of new snow through out the day, FL rising to 1300m, and light winds from the SW. Friday: 30cm+ of new snow, freezing level hovering at 1300m, and winds picking up to moderate values, gusting to strong from the SW.

Snowpack Summary

Extreme winds over the weekend created wind slabs on specific terrain features in the alpine and treeline. Soft slabs exist at treeline and below as the January 17th surface hoar has been incrementally buried. This layer is now buried 25-45cm, it is most reactive between 1400-1900m, and where it overlies a crust on steep solar aspects.

Avalanche Summary

No new avalanche activity obs in the HWY corridor yesterday. Numerous groups were out in the Backcountry/Alpine skiing all aspects and many of the classic steep lines with no reactivity. The one anomaly to the day was a skier accidental size 2.5, on a steep, rocky, unsupported, South facing slope. 2 involved, 1 partial and 1 full burial, see MIN.

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.