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Avalanche Forecast

Archived

Mar 26th, 2020–Mar 27th, 2020

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

Regions

Sea To Sky.

Incremental snow and wind have created heightened avalanche conditions at higher elevations.

Confidence

Low - Uncertainty is due to limitations in the field data.

Weather Forecast

Thursday night: Cloudy, 5-10 cm of snow, light to moderate southwest wind, freezing level dropping to 900 m, alpine temperatures reach -5 C.

Friday: Cloudy, up to 5 cm of new snow, light southwest wind, freezing level climbing to 1300 m in the afternoon, alpine temperatures reach -4 C.

Saturday: 20-30 cm of new snow, moderate southwest wind with strong gusts at ridge-tops, freezing level climbing to 1400 m in the afternoon, alpine temperatures reach -2 C.

Sunday: 15-25 cm of new snow, moderate southwest wind with strong gusts at ridge-tops in the late afternoon, freezing level climbing to 1400 m in the afternoon, alpine temperatures reach -2 C.

Avalanche Summary

A few small dry loose avalanches were reported on Monday, however mountain travel and field observations have been very limited over the past few days. Last week there were many wet loose avalanches, but cooler weather and a dusting of new snow has probably made isolated wind slabs the main concern this week.

Snowpack Summary

Incremental snowfall that has accumulated throughout the week and that is forecast to continue through the day on Friday covers a variety of previous snow surfaces including crusts, warm snow, and wind-affected snow. There is some uncertainty about how well the new snow will bond to these interfaces. The snowpack is generally strong and settled, with the exception of some areas in the eastern and northern parts of the region that have weak faceted snow near the base of the snowpack. However, this layer is considered dormant and has not produced an avalanche since February 20.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid terrain traps where the consequence of any avalanche could be serious.

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.