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Avalanche Forecast

Archived

Apr 19th, 2025–Apr 20th, 2025

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

Regions

Glacier.

New snow and wind will create a reactive storm slab in the Alpine.

Expect rain at lower elevations, making already challenging conditions worse.

Confidence

Moderate

Avalanche Summary

Few natural avalanches have been observed on the highway corridor over the past few days.

Neighboring operations are reporting small wet loose avalanches on solar facing terrain and natural cornice falls.

Last week there were a couple of notable skier triggered avalanches from high, north facing, alpine slopes where a sneaky layer of surface hoar was buried. One was on Bruins glacier and the other on the Dome, check out the MIN reports here and here.

Snowpack Summary

Spring storms have brought abit of new snow to the alpine and rain to lower elevations

Daily melt/freeze cycles are affecting the surface of the snowpack on solar slopes and all aspects up to 2200m, with several crusts of variable strength in the upper snowpack.

High alpine, north facing slopes still hold dry snow. A spotty surface hoar layer exists down ~20cms in sheltered north alpine areas..

Below treeline, conditions are variable and challenging travel exists.

Weather Summary

We'll experience unsettled weather Sunday & Monday with new snow and gusty winds.

Tonight Flurries. snow: 6cm. Alp low -6°C. Ridge wind W light gusting 35km/hr. Freezing Level (FZL) 1400m

Sun Flurries. Snow: 9cm. Alp high -3°C. West wind 10-20km/hr. FZL 1800m

Mon Flurries: 7cm. Trace precip. Alp high -4°C. West wind 10-25km/hr. FZL 1800m

Tues Sun & cloud. Trace precip. Alp high 1°C. Wind: W 20-40 km/hr. FZL 2000m

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the crust.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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.