Avalanche Forecast

Issued: Feb 17th, 2021 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Storm Slabs.

Avalanche Canada dsaly, Avalanche Canada

Email

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

Summary

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

An icon showing Storm Slabs

Snowfall accumulating through the day is not expected to bond well to a slippery crust. Expect storm slab size and sensitivity to increase through Thursday.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2

Valid until: Feb 18th, 2021 4:00PM