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Avalanche Forecast

Archived

Apr 14th, 2025–Apr 15th, 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.

If you see greater than 20 cm of new snow, treat the danger as CONSIDERABLE.

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

Confidence

Moderate

Avalanche Summary

Over the weekend, there were several rider triggered wind slabs from smaller wind loaded features. Mostly small (size 1) with a few large ones (size 2). Early reports indicate small wind slabs continue to occur on Monday.

On Friday, a rider triggered a large (size 2) wind slab on a north facing gully, also, a large glide slab avalanche released naturally.

Snowpack Summary

Around 10 cm of new snow redistributed by southerly wind lies over a crust that goes up to 1250 m in the shade and 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

Monday Night

Cloudy with 5 to 10 cm of snow. 40 to 60 km/h south ridgetop wind. Treeline temperature -6 °C.

Tuesday

Cloudy with 0 to 5 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1100 m.

Wednesday

Mostly cloudy with 1 to 2 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1100 m.

Thursday

A mix of sun and cloud. 30 to 40 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1200 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.