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Avalanche Forecast

Archived

Mar 21st, 2022–Mar 22nd, 2022

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

Regions

Yukon.

Avalanche danger will increase to HIGH as new snow and wind form fresh and reactive storm slabs.

Confidence

Moderate - Forecast snowfall amounts are uncertain. We are confident the likelihood of avalanche will increase with the arrival of the forecast weather.

Weather Forecast

Monday night: Snowfall 5-15 cm. Wind building to strong southeast. Alpine low around -6 °C.

Tuesday: Snowfall 10-30 cm. Strong southeast wind. Alpine high around -5 °C.

Wednesday: Snowfall 5-15 cm. Moderate to strong south wind. Alpine high around -7 °C.

Thursday: Snowfall 3-10 cm. Moderate to strong southeast wind. Alpine high around -5 °C.

Avalanche Summary

Recent avalanche activity has been limited to loose dry sluffing around size 1. Looking forward, natural and rider-triggered storm slabs will be likely during the storm on Tuesday.

If you head out into the mountains, and you have photos to share, conditions to report on, or just some stoke about the good riding, consider making a post on the Mountain Information Network. 

Snowpack Summary

20-40 cm of new snow is forecast to fall amid strong wind Tuesday in the White Pass area. The new snow falls over settling snow from the previous storm, wind slabs in exposed areas and a sun crust on steep solar aspects.

A couple of sun crusts exist in the upper snowpack but none have been identified as layers of particular concern. The lower snowpack is thought to be well protected by the dense, wind-pressed layers above, and it is unlikely that avalanches will be triggered on weak, sugary crystals near the ground at this time.

Terrain and Travel

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Avoid all avalanche terrain during periods of heavy loading from new snow and wind.
  • Stick to non-avalanche terrain or small features with limited consequence.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.