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Avalanche Forecast

Archived

Jan 11th, 2025–Jan 12th, 2025

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 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.

Regions

Glacier.

Buried surface hoar is known for wide propagations and surprises!

Carefully assess your slope prior to committing.

Confidence

Moderate

Avalanche Summary

Numerous natural avalanches were observed on Friday into early Saturday morning, caused by new snow and southerly wind. These averaged size 2-3 and were running far into the runouts.

On Thursday, a few natural wind slabs & dry loose avalanches were observed up to size 2.5 from steep alpine terrain in the highway corridor.

Snowpack Summary

We've received ~50cm of new snow since Jan 7th. This new snow buries a weak interface, which consists of widespread surface hoar on all aspects into the high alpine, and a thin suncrust on steep S to W aspects. Moderate southerly winds have redistributed this new snow into wind exposed terrain.

Overall the mid and lower snowpack is strong and well settled.

Weather Summary

High pressure builds, deflecting storms north.

Tonight Mainly cloudy. Alpine low -2°C. Light NW wind. Freezing level (FZL) 500m

Sun Cloudy w/sunny periods. Alpine high -11 °C. Light west wind. FZL 600m.

Mon Mix of sun & cloud. Alpine high -5 °C. Light west winds. FZL 900m. Alpine temperature inversion

Tues Mix of sun & cloud. Alpine high -1 °C. Moderate W winds. FZL 1400m. Alpine temperature inversion

Terrain and Travel Advice

  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.
  • Avoid areas where the snow feels stiff and/or slabby.
  • Be especially cautious as you transition into wind-affected terrain.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

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.