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Avalanche Forecast

Archived

Dec 24th, 2021–Dec 25th, 2021

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

Regions

Vancouver Island.

Fantastic snow and safest avalanche conditions can be found in low elevation, wind-sheltered terrain. We have uncertainty around a potential weak layer sitting beneath recent snow at upper elevations so if you plan to venture up high, make observations and assess as you go.

Confidence

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

Weather Forecast

Friday night: A trace of new snow. Light to moderate northwest wind shifting southwest. Freezing level dropping to sea level.

Saturday: Mainly cloudy, scattered flurries bringing 2-8 cm of snow. Moderate southwest winds. Treeline high temperatures near -12 C.

Sunday: A mix of sun and cloud. Light northeast wind. Treeline temperatures dropping to -17 C.

Monday: A mix of sun and cloud. Wind increasing to strong northwest. Treeline temperatures around -13 C.

Avalanche Summary

On Thursday, evidence of natural storm slab avalanches size 2-2.5 were observed out of north facing alpine terrain and several natural loose dry avalanches size 1-1.5 were observed in steep treeline terrain.

Snowpack Summary

Recent low density snow has likely been redistributed into atypical cross-loading or reverse-loading patterns by easterly wind at upper elevations. 15-30 cm now sits over a freezing rain crust below 1500 m and above this elevation it may rest on a layer of large surface hoar crystals. Our field team reported easy shears on this layer in their MIN report from during the storm on Wednesday. You can see photos of the surface hoar prior to being buried by the storm in these MIN reports from Elk Mountain on Monday and Mt Kitchener on Tuesday.

A crust-facet sandwich formed in early December can now be found a meter deep. These layers show limited reactivity and are well bridged by strong snowpack layers above them. Below, the snowpack is generally well-settled.

Terrain and Travel

  • Sheltered low elevation terrain will likely offer the best and safest riding today.
  • Be alert to conditions that change with elevation.
  • Closely monitor how the new snow is bonding to the crust.
  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.

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.