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Avalanche Forecast

Archived

Feb 24th, 2021–Feb 25th, 2021

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

Regions

South Coast.

Overnight snow and wind will form fresh storm slabs that are expected to become increasingly reactive throughout the day; especially in wind affected terrain. Choose very conservative terrain away from overhead hazard.

Confidence

Moderate - Uncertainty is due to the timing, track, & intensity of the incoming weather system. Forecast snowfall amounts are uncertain.

Weather Forecast

  

WEDNESDAY NIGHT: Snow; 15-20 cm. / Strong, southwest ridgetop wind / Alpine low -3 / Freezing level 400 m.

THURSDAY: Snow; 10-15 cm, with another 5-10 cm. overnight / Strong, northwest ridgetop wind / Alpine high 2 / Freezing level 800 m.

FRIDAY: Mix of sun and cloud / Light, northwest ridgetop wind / Alpine high 3 / Freezing level 1000 m.

SATURDAY: Mix of sun and cloud / Light, northwest ridgetop wind / Alpine high 1 / Freezing level 600 m.

Avalanche Summary

No new avalanches were reported in this region on Tuesday.

Snowpack Summary

The new snow is not expected to bond well to the hard crust now caps the snowpack up to the tops of the North Shore mountains. The new storm slabs are expected to be most reactive in wind affected terran. 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

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Expect slab conditions to change drastically as you move into wind exposed terrain.
  • Be careful to keep storm day fever from luring you out into bigger terrain features.

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.