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Avalanche Forecast

Archived

Apr 5th, 2021–Apr 6th, 2021

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The April sun is HOT!!

Minimize your exposure to sun exposed slopes, as large avalanches may be running far today!

And, don't forget about those reactive wind slabs in wind exposed areas in the alpine and treeline....

Weather Forecast

A ridge of high pressure will maintain dry and sunny weather until Wednesday.

Today: mix of sun and cloud. No precip. Freezing level rising to 1700m. Wind West 10 km/h.

Tonight: clear periods. No precip. Fzl lowering to 900m. Wind West 10-20 km/h.

Tuesday: mix of sun and cloud. No precip. Fzl 1900m. Wind SW-20 gusting to 50km/h.

Snowpack Summary

A convective 15-30cm of new snow fell at treeline overnight Saturday and into the day yesterday, dwindling to rain below 1200m. Wind blasted surfaces and suncrusts exist below the new snow. BTL, expect spring melt-freeze conditions. Recent snow over the March 18th suncrust and surface hoar has settled to about 80cm at treeline. Cornices are large!

Avalanche Summary

This morning a size 3.0 wind slab released naturally from the north side of Mt. Macdonald. Yesterday, a skier triggered a large wind slab on the north side of Cheops and field teams were able to ski cut small size 1.0 wind slabs on a convex roll below the Asulkan hut. Saturday, a group triggered a size 2 in a shallow, wind loaded area.

Confidence

Timing or intensity of solar radiation is uncertain

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.