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Avalanche Forecast

Archived

Apr 17th, 2021–Apr 18th, 2021

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Glacier.

A refreeze below treeline can be deceptive, sun exposed slopes above may already be moist this morning

Weather Forecast

Temperatures are staying high on Saturday. No precipitation and clear skies. Freezing level 2900m. Light NW wind

Above freezing temperatures are forecast again Saturday night with a weak inversion

Sunday no precipitation, sun and cloud, freezing level 2000m, moderate NE wind

Monday No precipitation, sun with some cloud, freezing level 1700m, light E wind

Snowpack Summary

Temperatures above freezing for 3 nights at treeline and above. N aspects are still holding dry snow in the alpine and at treeline. The April 7th layer is down 20-40cm depending on aspect and elevation, and the March 18th crust is down 60cm-1m. The mid and lower snowpack is very strong with old crusts and facets decomposing at the base.

Avalanche Summary

Numerous large slab and loose wet avalanches Thursday and Friday afternoon to sz 3.5 from solar start zones have been running into all aspects. A skier accidental sz 2 in Forever Young on Monday, see the MIN report here. Cornices have been triggered accidentally on approach this week and they continue to fall naturally without warning.

Confidence

Problems

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.

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.