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Avalanche Forecast

Archived

Apr 27th, 2022–Apr 28th, 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.

Seriously, is it still ski season at Rogers Pass?! 25cm of new snow Tuesday suggests it is.

The snowpack changes dramatically from crusty travel in the valley bottom to full-on winter in the Alpine. Change your mindset with the changing conditions.

Weather Forecast

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

Tonight: Cloud with clear periods, Alp low -6*C, light SW wind

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

Fri: Mix of sun/cloud, Alp high -3*C, FZL 1800m, light SW 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 25cm of new snow atop various older surfaces (melt-freeze crust, wind slab, or dry powder on high, sheltered, N'ly slopes).

Avalanche Summary

Crossover Gullies E and W, and Tractor Shed W, all spit out a sz 2 storm slab to half-path Tues.

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

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.