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Avalanche Forecast

Archived

Mar 25th, 2020–Mar 26th, 2020

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

Regions

South Coast.

Recent snowfall has created heightened avalanche conditions on steep slopes.

Confidence

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

Weather Forecast

Wednesday night: Increasing clouds, light northwest wind, freezing level dropping to 700 m, treeline temperatures reach -4 C.

Thursday: Cloudy, scattered flurries with trace accumulations, light southwest wind, freezing level around 1000 m, treeline temperatures reach -3 C.

Friday: 10-20 cm of new snow, light southwest wind, freezing level climbing to 1200 m in the afternoon, treeline temperatures reach 0 C.

Saturday: 10-20 cm of new snow, moderate southwest wind with strong gusts at ridge-tops, freezing level climbing to 1300 m in the afternoon, treeline temperatures reach 0 C.

Avalanche Summary

Slab avalanches are a concern on slopes with accumulations of new snow, especially in wind-loaded terrain. No recent avalanches have been reported, but mountain travel and field observations have been very limited over the past few days.

Snowpack Summary

15-25 cm of recent snow 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 well-settled. Snowpack depths diminish rapidly with elevation, with 300-400 cm at treeline and no snow below 700 m.

Terrain and Travel

  • Closely monitor how the new snow is bonding to the old surface.

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.