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Avalanche Forecast

Archived

Apr 25th, 2025–Apr 26th, 2025

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

Regions

Glacier.

Hot, Hot, Hot! Warm temperatures are forecast to mountain tops this week.

Expect the hazard to rise if the surface crust is breaking down.

Get an EARLY start ....and an early finish to beat this heat.

Confidence

Moderate

Avalanche Summary

Minimal avalanche activity has been noted in the park the last couple of days

A MIN reported loose snow avalanches on the steep S slopes of Swiss Peak Wednesday.

Neighboring operations have been observing solar triggered loose snow avalanches out of steep terrain this week, up to size 3. As well as a few natural cornice failures up to size 2.5

Snowpack Summary

The most recent storm snow that fell in the alpine has been settled and squished by the warm temperatures on all but the highest North facing slopes. A decent corn snow cycle has been occuring on solar slopes, but timing is everything! With forecasts for rising freezing levels and poor overnight "re-freeze", we could see the snowpack rapidly deteriorate and become isothermal. Expect variable conditions below treeline.

Weather Summary

A ridge of high pressure maintains clear skies with rising freezing levels in to the weekend.

Tonight Clear. Alpine Low +5°C. Light South Ridge winds. Freezing Level (FZL) 2600m.

Sat A mix of sun and cloud. Alpine High 7 °C. Wind Light. FZL 2700m.

Sun A mix of sun and cloud. Alpine Low 1 °C, High 4 °C. Light NW wind. FZL 2500m.

Mon Cloudy with wet flurries. Alpine High +6°C. Light SW wind. FZL 2600m.

Terrain and Travel Advice

  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Avoid travelling on slopes below cornices.

Problems

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.