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Avalanche Forecast

Archived

Apr 12th, 2022–Apr 13th, 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.

Continue to practice your safe backcountry travel habits even when the hazard is low. Small avalanches can have large consequences in the wrong terrain!

Weather Forecast

Cool temps with freezing levels at valley bottom, a mix of sun, cloud, and Easterly winds for a few days.

Tonight: Mainly clear, Alp low -18*C, light to Mod winds from the East.

Wed: Mix of sun and cloud, Alp High -11*C, light winds from the East

Thursday: Mix of sun/cloud, Alp low -15*C/high -9*C, light winds from the East

Snowpack Summary

Widespread wind effect in the Alpine and upper treeline has left behind wind slabs on specific terrain features, and stripped the new snow away in others; however, there are still reports of decent conditions in the Alpine in sheltered zones. At Treeline and below the spring snowpack currently has a solid supportive melt-freeze crust.

Avalanche Summary

No new avalanches have been observed in the HWY corridor in the last few days. A close call occurred on Monday, where a small pocket of wind slab nearly took a skier into a crevasse! Click on the link here for the full report. Lingering cornices are starting to fail in the Alpine, with one triggering a deep persistent weak layer to the NW of GNP.

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.