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Avalanche Forecast

Archived

Mar 28th, 2020–Mar 30th, 2020

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

Regions

South Coast Inland.

New snow and strong winds are creating dangerous avalanche conditions. This is the final forecast for the season.

Confidence

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

Weather Forecast

Saturday night: Cloudy, 5-10 cm of new snow, moderate southwest wind gusting strong at ridge-tops, freezing level dropping to 1300 m, alpine temperatures reach -5 C.

Sunday: Cloudy, up to 5 cm of new snow, moderate southwest wind gusting strong at ridge-tops, freezing level climbing to 1400 m in the afternoon, alpine temperatures reach -6 C.

Monday: Cloudy, 5-15 cm of new snow, moderate southwest wind, freezing level climbing to 1200 m in the afternoon, alpine temperatures reach -6 C.

Tuesday: Cloudy, scattered flurries with a trace of new snow, light southwest wind, freezing level climbing to 1000 m in the afternoon, alpine temperatures reach -7 C.

Avalanche Summary

Slab avalanches are a concern on slopes with accumulations of new snow, especially in wind-loaded terrain. Mountain travel and field observations over the past week have been very limited. Little is known about recent avalanche activity.

Snowpack Summary

New snow and strong southwest winds are building reactive storm slabs and creating dangerous avalanche conditions. 

Snowfall from earlier in the week was highly variable across the region with some areas receiving 15-25 cm and adjacent valleys getting as little as 0-5 cm. Some of the heavier accumulations fell in the south part of the region. This snow covered a variety of previous snow surfaces including crusts, warm snow, and wind-affected snow. It may also sit above some small surface hoar on shaded, sheltered slopes. Overall, there is some uncertainty about how well the snow has bonded to these interfaces.

Northern parts of the region have had a deep instability lingering at the base of the snowpack for most of the season, however this layer has gained strength over the past month (with the last reported avalanche on Feb 17).

Terrain and Travel

  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.

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.