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Avalanche Forecast

Archived

Feb 1st, 2024–Feb 2nd, 2024

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

Regions

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

Avoid wind slabs and find good quality riding up high on planar, wind-sheltered alpine slopes like glaciers and low angle gullies.

Confidence

Moderate

Avalanche Summary

Over the last 2 days our field team did not observe any new avalanche activity but observed evidence of the natural cycle that occurred during the warm storm earlier in the week. In White Pass, up to size 2 avalanches were widespread at treeline and isolated in the alpine and in the Wheaton area widespread at all elevations, up to size 2.5.

Snowpack Summary

At upper elevations, 10-40 cm of recent dry snow has been redistributed by strong southerly winds, shifting northerly as of Thursday. This recent snow has been observed to be bonding well to an underlying crust, reaching up to 1500 m in White Pass and 1200 m in the Wheaton area.

Weather Summary

Thursday night

Partly cloudy with a trace of new snow. Light southeast ridgetop wind, switching to southwest by the afternoon. Treeline low around -20 °C.

Friday

A trace of snow in the morning then clearing to a mix of sun and cloud. Light northwest ridgetop wind. Treeline temperature around -25 °C.

Saturday

A mix of sun and cloud. Southwest ridgetop wind 40-50 km/h. Treeline temperature around -25 °C.

Sunday

Mostly cloudy with a trace of snow. Southwest ridgetop wind 50-60 km/h. Treeline temperature warming up to -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind loaded terrain features.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.