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Avalanche Forecast

Archived

Jan 31st, 2021–Feb 1st, 2021

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

Regions

Sea To Sky.

Strong winds are expected to continue to form fresh and reactive storm slabs, keeping avalanche danger elevated. Stick to simple terrain and avoid overhead hazard.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

SUNDAY NIGHT - Flurries, 5-10 cm / moderate to strong southwest wind / alpine low temperature near -4 

MONDAY - Flurries, 5-10 cm with another 15-25 cm overnight / moderate to strong southwest wind / alpine high temperature near -2 

TUESDAY - Flurries, 10 cm / moderate to strong southwest wind / alpine high temperature near -5 

WEDNESDAY - A mix of sun and cloud / light northwest wind / alpine high temperature near -7 

Avalanche Summary

Avalanche activity is expected on Monday with both natural and human triggered avalanches likely.

At the time of publishing, there were numerous size 1-1.5 human and explosives triggered storm slab avalanches reported on Sunday.

There were several size 1-2 natural, human, and explosives triggered avalanches reported in the region on Saturday.

Snowpack Summary

The Sea-to-Sky region has received between 30-60 cm since Saturday night, and it is expected to continue to pile up on Monday, with an additional 5-10 cm.

There is now about 30-70 cm of recent snow sitting on firm wind affected snow at upper elevations, on surface hoar in sheltered areas, on a melt-freeze crust below 1900 m, and on a sun crust on south-facing slopes.

A crust from early December may be found around 200 cm deep in the snowpack. In shallow rocky areas, recent test results suggest that it may still be possible to trigger this layer. In deeper snowpack areas it has shown no recent results and appears to be unreactive in these areas.

Terrain and Travel

  • Use conservative route selection. Choose simple, low-angle, well-supported terrain with no overhead hazard.
  • Avoid freshly wind loaded terrain features.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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.