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Avalanche Forecast

Archived

Apr 1st, 2021–Apr 2nd, 2021

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

Jasper.

Windslabs building incrementally with small inputs of snow and steady SW winds.

Be cautious in all lee features!

Weather Forecast

A low pressure system moving south will continue to push moisture into the region. Isolated snowfall with only light accumulation, with heaviest bands of flurries in the Icefields regions.

Snowpack Summary

Widespread variability on the surface. Steady moderate SW flow, forming wind slabs on W through N aspects at TL and ALP. Inconsistent travel conditions and open water below 1800m. The snowpack shows strength and good bonding in field tests but "feels" weak in typically shallow snowpack regions like Whistlers/Portal creek and Maligne zones.

Avalanche Summary

Big shout-out to all the past and recent contributors on the Mountain Information Network; you'll are our second set of eyes, ears and feet in the terrain! Keep up the posts! Anyone still ice climbing out there?

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.