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Avalanche Forecast

Archived

Apr 4th, 2022–Apr 5th, 2022

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

Regions

Glacier.

Spring-time is here; begin and finish your day early while low elevation slopes remain cooler.

Localized convective flurries may bring intense bouts of stormy weather followed by strong sun the next couple of days.

Weather Forecast

A mix of sun and cloud the next couple days, with convective cells delivering localized intense flurries.

Tonight: Flurries, trace to 5cm, Alp low -9*C, FZL 800m, mod/strong SW winds

Tues: Mainly cloudy with flurries, trace to 5cm, Alp high -9*C, FZL 1300m, mod/strong W winds

Wed: Sun and cloud, Alp high -6*C, FZL 1200m, light W winds

Snowpack Summary

45-65cm of storm snow at Treeline and above (drainage dependant due to convection) has buried a variety of surfaces including wind slabs, solar crusts to mountain top, and a melt/freeze crust to 2200m. Northerly slopes in the Alpine hold cold, wintery snow. The December 1st crust is down 1.5-2m. Late season cornices are LARGE!

Avalanche Summary

Artillery control on Monday produced large slab avalanches, up to sz 3-3.5, on N aspects of Macdonald and Smart. S'ly aspects were not as reactive to explosives.

Natural avalanche activity increased late Monday morning/afternoon when the SW winds finally arrived, along with brief, intense bursts of snow then sunshine.

Confidence

Due to the number of field observations

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.