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Avalanche Forecast

Archived

Dec 13th, 2021–Dec 14th, 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 avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Forecast snow and wind overnight on Monday are expected to form fresh storm slabs reactive to human triggers, especially in wind-affected terrain.

Make conservative terrain choices, and use small slopes, with low consequence to test the bond of the new snow.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

MONDAY NIGHT: Snow, 15-25 cm / Strong, southeasterly winds / Low of -2 C / Freezing level 500 m.

TUESDAY: Mostly cloudy with flurries; 0-3 cm / Moderate, southeasterly winds / High of 0 C / Freezing level 600 m.

WEDNESDAY: Mostly cloudy / Light, westerly winds / High of 1 C / Freezing level 700 m.

THURSDAY: Mix of sun and cloud / Light, northwesterly winds / High of 1 C / Freezing level 600 m.

Avalanche Summary

Forecast 15-25 cm of snow and strong southeasterly winds overnight Monday are expected to form fresh storm slabs reactive to human triggers, especially in wind-affected terrain.

Snowpack Summary

Forecast 15-25 cm of snow and strong southeasterly winds overnight Monday are expected to form fresh storm slabs reactive to human triggers, especially in wind-affected terrain.

Below the early December crust layers, the snowpack is generally well-settled and strong. 

Terrain and Travel

  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Shooting cracks, whumphs and recent avalanches are strong indicators of an unstable snowpack.
  • Use small low consequence slopes to test the bond of the new snow.
  • Avoid terrain traps where the consequence of any avalanche could be serious.

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.