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Avalanche Forecast

Archived

Jan 28th, 2015–Jan 29th, 2015

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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Cooler temperatures are slowly healing the snowpack.  Watch for areas with buried surface hoar and isolated wind slabs on high alpine features.  Ski conditions are generally poor.  SH

Weather Forecast

Alpine temperatures will be in the -10 to -12C range for Thursday with light to moderate NW winds. The only "snow" in the forecast is the possibility of a few cm Saturday, but this will not affect the avalanche danger.

Snowpack Summary

Very strong westerly winds have seriously blasted the region. Wind pressed snow in lee terrain can be expected at treeline and above. A crust up to 2500m (higher on solar aspects) can be found in all areas. The Dec18th surface hoar/facet/crust interface can be found down 50-70 cm at treeline. This layer will be less reactive with the cooler temps.

Avalanche Summary

No new avalanches were reported in the Little Yoho region today.

Confidence

Due to the quality of field observations on Wednesday

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.