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Avalanche Forecast

Archived

Jan 8th, 2017–Jan 9th, 2017

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

Little Yoho.

The new snow Monday will increase the load over the weak mid-pack facets and increase the hazard slightly. The biggest concerns are at treeline, in shallow snowpack areas, or in areas there wind loading has occurred. Probe often to find these areas.

Weather Forecast

5-10cm of snow is forecasted for Sunday night with another 5-10cm of snow on Monday night. Winds will be moderate out of the west with slightly warmer temperatures. The clear skies and cold temperatures return on Tuesday as another ridge of high pressure builds.

Snowpack Summary

Recent winds have created firm surface slabs in many open areas. A 100-150 cm snowpack exists at tree line. In thinner snowpack areas the weak mid-pack facets exist and the main issue is the cohesive surface slab over the facets with potential for larger propagations. Thicker snowpack and higher elevation areas have few weaknesses.

Avalanche Summary

No natural activity was reported or observed in Little Yoho Sunday. Some recent observations in the surrounding area continue to show occasional slabs failing on the mid-pack facets during the last week. Lots of whumphing on the mid-pack facets at treeline was reported recently in the Stanley Mitchell area.

Confidence

Forecast snowfall amounts are uncertain on Monday

Problems

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.