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Avalanche Forecast

Archived

Jan 30th, 2015–Jan 31st, 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.

Hazard has dropped to Low but it is still worth evaluating all terrain with caution. Ski conditions are rugged at the moment at treeline and below but ice climbing is getting better with each passing day as cooler temperatures prevail.

Weather Forecast

Westerly flow and mild temps for today and tonight and then for Saturday Northwesterly flow creating a cooling trend.  Sunday the flow goes back to westerly and light snowfall develops through until the beginning of the week.  Freezing levels should go to valley bottom by tomorrow and remain low for the next few days.

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 natural avalanche activity was observed or reported today, however one explosive result up to size 2 out of a steep & complex alpine feature was reported by Lake Louise yesterday so avalanches are still possible out of steep, rocky alpine terrain in isolated terrain features with larger triggers.

Confidence

Due to the number of field observations on Saturday

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.