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Avalanche Forecast

Archived

Jan 29th, 2015–Jan 30th, 2015

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Danger levels have moved to LOW at all elevations owing to melt-freeze crusts to treeline, and wind blasted snow above. Ski conditions are generally rugged, while ice climbing conditions in Field are excellent - plastic ice and low avalanche danger.

Weather Forecast

A westerly flow continues, with no significant systems moving through the area for the next 24-hours. Expect Friday to be sunny with some clouds, particularly late in the day. Temperatures will range from 0 to -8, and  expect 3-5 cm of snow overnight on Friday. This might just freshen up the ski quality for Saturday.

Snowpack Summary

After a period of warm weather, the return to colder temperatures has improved the stability of the snowpack, particularly at treeline and below where strong melt-freeze crusts now dominate. In isolated areas we expect the Dec 18 surface hoar layer to remain, but triggering is unlikely. Recent winds have blasted the terrain at higher elevations.

Avalanche Summary

No new avalanches observed or reported today.

Confidence

Due to the number and quality of field observations

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.