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Avalanche Forecast

Archived

Jan 9th, 2017–Jan 10th, 2017

Alpine
Natural avalanches possible, human triggered probable.
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.

Ice climbers take note of the recent new snow and the potential for loose snow avalanches. Though only small avalanche are expected, they may have a significant affect to an ice climber.

Weather Forecast

One last pulse of snow is expected this evening as the arctic air moves in. Moderate winds will taper to low by tomorrow and temperature will drop to the low -20s. This cold air mass will arrive with clear sky's and is not expected to last for weeks ....

Snowpack Summary

10cm of new snow sits over firm slab in the alpine, this new snow has had some wind affect. Expect small reactive windslab development in the alpine. At treeline and below the new snow remains low density and overlays a faceted snowpack. Areas with even some cohesive slab structure near the surface have the potential to fail over the facets.

Avalanche Summary

No natural activity was reported or observed in Little Yoho Monday. 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

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.

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.