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Avalanche Forecast

Archived

Feb 20th, 2025–Feb 21st, 2025

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

Regions

Glacier.

An incoming storm will bring new snow, warm temps and increased winds.

As the storm progresses the avalanche danger will rise.

Confidence

Moderate

Weather Summary

An active weather pattern is developing with a juicy storm on the horizon.

Tonight Cloudy with flurries, Snow: trace . Alpine low -7°C. Ridge winds SW 25km/hr

Fri Flurries. 9cm. Alp high -6°C. Ridge wind SW 25-40km/h. Freezing level (FZL) 1300m.

Sat Snow! 29 cms. Alp high -3°C. Ridge wind SW 30 gusting 55. FZL rising to 1600m.

Sun Periods of snow, 11cms. Alp high -3°C. Ridge wind SW 20km/h, gusting 85. FZL 1500m.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Storm slab size and sensitivity to triggering will likely increase through the day.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.