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Avalanche Forecast

Archived

Apr 14th, 2022–Apr 15th, 2022

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

Glacier.

It's still winter up high. This means good skiing on some slopes, and triggerable windslabs on others. Exercise extra caution where you're punching through stiffened surface snow.

Weather Forecast

A weak low to the South stirs things up a bit Friday, then it's back to high pressure.

Tonight: Mainly cloudy. Alpine Low -14 C.

Friday: Sunny periods/isolated flurries. High -8 C. Freezing level (FZL) 1100m. Light E ridgetop wind.

Sat: Mainly sunny. Low -11 C, High -6 C. FZL 1400m. Light E wind.

Sun: Mixed sun/cloud. Low -9 C, High -5 C. FZL 1500m.

Snowpack Summary

Wind effect in the alpine and at treeline from variable winds, has left behind wind slabs in many open terrain features, and scoured the new snow off of ridge crests.  Settled powder can however still be found on sheltered alpine slopes. Below treeline the spring snowpack is currently locked in by a supportive melt-freeze crust.

Avalanche Summary

No new avalanches in the HWY corridor.

On Wednesday, there was a size 3 cornice fall off of Mt Bonney (triggered by a skier on belay), and skier remote size 1 near the Asulkan.

On Tuesday a group triggered several size 1 wind slabs in the Ravens.

And on Monday, there was a close call when a small wind slab nearly took a skier into a crevasse!

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.