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Avalanche Forecast

Archived

Jan 31st, 2021–Feb 1st, 2021

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

Regions

South Coast Inland.

Fresh storm slabs are expected to be widespread and reactive, and they may be larger than expected due to the presence of a buried weak layer. Choose simple terrain and avoid overhead hazard.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

SUNDAY NIGHT - Flurries, 5-10 cm / moderate to strong southwest wind / alpine low temperature near -4 

MONDAY - Flurries, 5-10 cm with another 10-15 cm overnight / moderate to strong southwest wind / alpine high temperature near -2 

TUESDAY - Flurries, 5-10 cm / moderate to strong southwest wind / alpine high temperature near -4 

WEDNESDAY - A mix of sun and cloud / light northwest wind / alpine high temperature near -6

Avalanche Summary

Reactive storm slabs are expected to be widespread on Monday, and human triggered avalanches remain likely.

At the time of publishing, there were several reports of size 1-1.5 natural and human triggered avalanches in the region on Sunday.

Snowpack Summary

10-20 cm of new snow is expected to accumulate between Sunday night and Monday afternoon. This will bring total recent fresh snow amounts to 25-50 cm, which sits on firm wind affected snow at upper elevations, on surface hoar in some sheltered areas, on a melt-freeze crust below 1600 m, and on a sun crust on south-facing slopes.

In the south, the underlying snowpack is well consolidated. In the north, a melt-freeze crust from early December may be found 100 to 200 cm deep. Recent reports suggest that this layer is gaining strength and it has been unreactive in recent weeks.

Terrain and Travel

  • Conditions are expected to deteriorate throughout the day.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • Minimize exposure during periods of heavy loading from new snow and wind.

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.