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Avalanche Forecast

Archived

Apr 10th, 2021–Apr 11th, 2021

Alpine
Natural avalanches possible, human triggered probable.
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

Glacier.

Winter weather maintains its grip on Rogers Pass. The refresh of powder also brings a storm instability that requires careful terrain selection to avoid heavily loaded areas.  Watch for loose avalanches if the sun comes out.

Weather Forecast

Moderate snow will continue today with 7cm of accumulation.  Alpine high will reach -9, W winds 25-45km/h, freezing level at 1000m. A high pressure system builds later this evening with a return to clear skis and cool overnight temps of the coming week. Sun and daytime warming will bring spring conditions. Freezing levels rise sharply on Wednesday.

Snowpack Summary

15cm of new snow fell overnight with strong S winds. Storm/ wind slabs cover a variety of old surfaces: settled powder on sheltered alpine N aspects, wind slabs/ wind pressed surfaces in exposed areas, a sun crust on solar aspects, and spring melt/freeze crust below treeline. Cornices are large and fragile. The March 18 crust is buried ~80-100cm.

Avalanche Summary

A field crew was able to ski cut several small size 1.0 thin wind slabs while descending Macdonald West Shoulder #4. Two large glide releases (size 4 and size 3) released earlier this week in the highway corridor off of Mt Tupper.

Confidence

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.