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Avalanche Forecast

Archived

Feb 22nd, 2021–Feb 23rd, 2021

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

Regions

South Coast.

Avalanche danger is limited to high elevation alpine terrain where snow accumulated over the weekend.

Confidence

High - We have a good understanding of the snowpack structure and confidence in the weather forecast

Weather Forecast

Cool dry weather until the next storm arrives on Thursday.

MONDAY NIGHT: Cloudy, moderate west wind, treeline temperatures drop to -4 C.

TUESDAY: Some isolated flurries in the morning then clearing in the afternoon, moderate northwest wind at ridgetops, treeline temperatures around -2 C.

WEDNESDAY: Mostly sunny, light wind, treeline temperatures around -2 C.

THURSDAY: Flurries with 15-25 cm of snow, strong southwest wind, freezing level up to 800 m with treeline temperatures around -1 C.

Avalanche Summary

Some small (size 1) storm slab and wet slab avalanches were reported during the storm over the weekend, and a natural avalanche cycle likely occurred on Sunday night. Looking forward the only concern is upper treeline and alpine elevations where storm slabs may exist in steep terrain.

Snowpack Summary

A hard crust now caps the snowpack up to the tops of the North Shore mountains. High elevation terrain in other parts of the region could have up to 50 cm of recent snow, likely heavily wind affected. However there are no observations to confirm alpine conditions.

Terrain and Travel

  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.