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Avalanche Forecast

Archived

May 1st, 2019–May 2nd, 2019

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

Regions

Jasper.

Winter still exists in Jasper! Good skiing can be found in the right locations.

Weather Forecast

Cold and snowy for the next few days, Wednesday night around 10cm with light westerly winds with alpine temps around -4. Thursday flurries with an alpine high of -2 with around 5-10cm of accumulation with freezing levels up to 2100m. Friday flurries with alpine temps -5 moderate winds with strong gusts from the west with freezing levels at 1800m.

Snowpack Summary

5-15cm new low density snow overlies previous slabs built from N winds that may still be reactive in isolated alpine terrain where a crust is present. Buried facet layers remain a concern with small whumpfs and variable test results. Most concern is on protected northerly alpine features or where they sit on buried crusts.

Avalanche Summary

A team in the Columbia Icefields on wednesday did not observe any new avalanches. To the South of our region (Bow Summit), 2 large (size 2 - 2.5) persistent slabs were remotely triggered on alpine SW aspects Tuesday. On Sunday, 1 Large (size 2.5) Persistent slab was observed in the Maligne Range on an East aspect, in convex alpine terrain.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

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.