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Avalanche Forecast

Archived

Jan 14th, 2017–Jan 15th, 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.

Our current snowpack is difficult to asses. Due to the variability, snowpack observations hold little weight over large areas of terrain. 

Weather Forecast

Warming trend through the week with valley bottom temperatures forecasted to reach above freezing. Precipe expected latter in the the week with forecasted accumulation amount quite varied at this times.

Snowpack Summary

Up to 20 cm of low density snow has been blown into hard wind slabs from north winds. These slabs overly a highly variable snowpack that consist mainly of facets, this facet / slab is the main concern in the snowpack. In most shelter areas and at lower elevators the snowpack has little to no structure.

Avalanche Summary

No avalanche activity reported or observed in Little Yoho today, but we have minimal observations from this area - so low confidence.

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.