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Avalanche Forecast

Archived

Apr 18th, 2025–Apr 19th, 2025

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

Regions

Glacier.

With strong SW wind and light snow Friday overnight, be on the lookout for thin, fresh windslabs in the alpine.

Challenging travel conditions exist at lower elevations.

Confidence

Moderate

Avalanche Summary

Few natural avalanches have been observed on the highway corridor over the past 4 days.

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

On Apr 14, a party observed several sz 2 wet/loose avalanches from steep, S-facing terrain on Mt Green.

On Apr 11, a skier triggered sz 2 wind slab on the Dome glacier at 2450 m, NE asp.

Also on Apr 11, a wide-propagating, rider triggered sz 2.5 on Bruins Glacier.

Snowpack Summary

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, buried surface hoar layer exists down 15-40cm in sheltered north alpine areas above ~2300m. This layer has been reactive to human triggering in the past week.

Below treeline, conditions are variable and challenging travel exists.

Weather Summary

Saturday a cold front ushers in bringing flurries/showers and unsettled conditions into Sun/Mon.

Tonight Cloudy. 7cm. Alp low -2°C. Ridge wind NW 25-50 km/h. Freezing Level (FZL) 1800m

Sat Sun & cloud. Trace precip. Alp high -2°C. SW wind 20-40 km/h. FZL 1900m

Sun Scattered flurries. 5cm. Alp high -4°C. West wind 10-30km/hr. FZL 1800m

Mon Flurries. Trace precip. Alp high -1°C. West wind 20-35km/hr. FZL 1900m.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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.