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Avalanche Forecast

Archived

Feb 17th, 2021–Feb 18th, 2021

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

Regions

South Coast.

Flurries and new snow are not expected to bond well to a slippery crust. Expect avalanche size and sensitivity to increase as snowfall accumulates.

Confidence

Moderate - We are confident the likelihood of avalanche will increase with the arrival of the forecast weather. Uncertainty is due to the timing of the incoming weather system.

Weather Forecast

WEDNESDAY NIGHT: Cloudy / moderate south wind / ridgeline temperature low -6 / freezing level dropping below 500 m

THURSDAY: Flurries and snow, 10-15 cm accumulating through the day / moderate south-southwesterly wind / ridgeline temperature high -1 / freezing level below 900 m

FRIDAY: Heavy snow, 20-30 cm / moderate gusting to high southerly wind / ridgeline temperature high -1 / freezing level around 700 m

SATURDAY: Cloudy with flurries, 5 cm / moderate southerly wind / ridgeline temperature high -2 / freezing level around 700 m

Avalanche Summary

On Monday, riders found soft low density storm snow rapidly gaining strength and reactivity as temperatures warmed through the day. Slab avalanches size 1-1.5 and 15-30 cm deep released naturally and were triggered by skiers and explosives in the afternoon. There are some tremendous visuals in this MIN report. 

Snowpack Summary

Snowfall accumulating Thursday will cover a widespread crust on most slopes and a variety of wind affected surfaces and crusts at upper elevations.

An unusual mix of facets, thin breakable crust, and isolated pockets of surface hoar is found 15-30 cm below the surface. This overlies 30-40 cm of gradually faceting snow, over a wide spread and supportive crust underneath. The snowpack is well settled below.

Terrain and Travel

  • Closely monitor how the new snow is bonding to the old surface.
  • Be alert to conditions that change with elevation.
  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Use increased caution at all elevations. Storm snow is forming touchy slabs.

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.