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Avalanche Forecast

Archived

Apr 6th, 2021–Apr 7th, 2021

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

Regions

Glacier.

The Spring Sun will cook up some avalanches as it warms the slopes. Save the suntanning for the beach and hustle across any solar-exposed terrain.

Lingering windslabs lurk on N through E aspects. Pay attention to these pockets as you drop your line.

Weather Forecast

A ridge of high pressure will maintain dry, sunny weather today. Snow moving in Wed.

Today: mix of sun and cloud, FZL 2000m, ridge wind SW 15km/h gusting 40km/h.

Wed: Snow. 15-20cm, Alp high -4*C, FZL 1600m, ridge wind 20km/h gusting 60km/h

Thurs: Cloudy with isolated flurries and sun, trace precip, FZL 1400m, ridge winds 20km/h gusting 45km/h

Snowpack Summary

15-30cm of snow fell at treeline overnight Saturday and into Sunday; this was rain below 1200m. Wind blasted surfaces and suncrusts exist below the new snow, while the March 18th suncrust and surface hoar is buried ~80cm at treeline. Spring melt/freeze conditions prevail below treeline and on solar aspects to treeline.

Avalanche Summary

On Monday, a lone size 3.0 wind slab released naturally from the north side of Mt. Macdonald. Sunday, 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

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.