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Avalanche Forecast

Archived

Apr 16th, 2025–Apr 17th, 2025

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West, Haines Pass.

Avoid wind loaded areas and only expose one person at a time to avalanche terrain.

Conditions can change rapidly in spring, read about the 4 likely scenarios here.

Confidence

High

Avalanche Summary

A small wind slab was seen on Monday from a northwest facing slope at treeline.

Avalanche activity has tapered since the weekend, and so have the number of observations.

Snowpack Summary

Around 10 cm of recent snow redistributed by southerly wind lies over a crust that goes up to 1250 m in the shade and up to mountain top on slopes that get the sun. Good riding can still be found in sheltered slopes away from the sun.

The mid-pack is generally well settled, with crusts buried around 50 cm, and another near 130 cm deep.

The lower snowpack is facetted, but hasn't been a problem.

Below 1100 m the snowpack is wet and losing strength.

Weather Summary

Wednesday Night

Cloudy. 40 to 80 km/h south ridgetop wind. Treeline temperature -4 °C.

Thursday

Cloudy with 0 to 1 cm of snow. 50 to 90 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 800 m.

Friday

Mostly cloudy with 5 to 15 cm of snow. 30 to 40 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Saturday

Mostly cloudy with 5 to 10 cm of snow. 30 to 40 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Avoid freshly wind-loaded terrain features.

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.

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.