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Avalanche Forecast

Archived

Apr 26th, 2022–Apr 27th, 2022

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.

The snowpack in Rogers Pass is significantly different at higher elevations than in the valley bottom. Be aware of the changing conditions as you ascend into the Alpine.

Weather Forecast

Unsettled wx through Thurs with isolated flurries. Diurnal pattern of overnight cooling and freezing levels (FZL) rising during the day.

Tonight: Mainly cloudy, isolated flurries, Alp low -8*C, FZL 800m, mod SW wind

Wed: Sun/cloud, Alp high -6*C, FZL 1500m, light/mod SW wind

Thurs: Mix of sun/cloud, Alp high -4*C, FZL 1800m, light W wind

Snowpack Summary

There are 2 distinct snowpacks at the moment. Below 2000m exists a firm Spring-time melt-freeze snowpack that is solid in the am, then breaking down with daytime warming. Above 2000m, a winter snowpack dominates, with 20cm of new snow atop various older surfaces (melt-freeze crust, wind slab, or dry powder on high, sheltered, N'ly slopes).

Avalanche Summary

Several moist natural avalanches to sz 2.5 were observed on Avalanche Crest Monday night, roughly starting at 1900m.

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.

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.