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Avalanche Forecast

Archived

Feb 25th, 2023–Feb 26th, 2023

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, 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.

Regions

Glacier.

Avalanche hazard should spike overnight and tapper in to Sunday, as a frontal system passes our area. Avoid exposure to overhead avalanche terrain early in the day, especially if the storm continues a little longer than is forecast.

Confidence

Moderate

Avalanche Summary

We are expecting a natural cycle of avalanches overnight, triggered by moderate snowfall and strong winds. Natural activity will likely tapper off into Sunday, but should be factored into your morning route plan.

Snowpack Summary

Incoming new snow will bury facetted wind effect and settled powder.

The deep persistent weakness near the base of the snowpack consists of rounding facets, as well as a decomposing crust in some locations.

Weather Summary

We're going to get a solid dose of low density snow overnight into Sunday, as a frontal system collides with the arctic air that's been parked over our area this past week.

Tonight: Snow (10-15cm). Alpine low -12 °C. Moderate-strong SW winds @ridgetop.

Sunday: Flurries (10cm). Alpine high -9 °C. Light gusting to strong SW wind.

Monday: Isolated flurries. Low -16 °C, High -12 °C. Light SW wind.

Tuesday: Flurries (5cm). Low -16 °C, High -10 °C. Light variable winds.

Terrain and Travel Advice

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Be especially cautious as you transition into wind affected terrain.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.