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Avalanche Forecast

Archived

Feb 25th, 2021–Feb 26th, 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 possible, human triggered probable.
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.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Storm slabs sitting on a hard rain crust may continue to be reactive to human triggers; especially in wind affected terrain.

Confidence

High -

Weather Forecast

  

THURSDAY NIGHT: Cloudy with flurries; 3-5 cm. / Strong, northwest ridgetop wind / Alpine low -4 / Freezing level 600 m.

FRIDAY: Mix of sun and cloud / Light, northwest ridgetop wind / Alpine high 1 / Freezing level 700 m.

SATURDAY: Mix of sun and cloud / Light, northwest ridgetop wind / Alpine high 0 / Freezing level 600 m.

SUNDAY: Cloudy with flurries; 5-10 cm. / Strong, west ridgetop wind / Alpine high 2 / Freezing level 1000 m.

Avalanche Summary

On Thursday, skier triggered storm slab avalanches up to size 2 were reported on all aspects. The new snow is sitting on a hard rain crust and may remain reactive to human triggers; especially in wind affected terrain.

Snowpack Summary

15-20 cm of new snow and strong southwesterly winds have formed fresh storm slabs sitting on top of a hard rain crust that caps the snowpack up to the tops of the North Shore mountains. These storm slabs are expected to be most reactive in wind affected terran. 

The snowpack below the rain crust is well settled and strong in most areas.

Terrain and Travel

  • Expect slab conditions to change drastically as you move into wind exposed terrain.
  • Closely monitor how the new snow is bonding to the crust.
  • Keep in mind the crust offers an excellent bed surface for avalanches.

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.