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Avalanche Forecast

Archived

Jan 9th, 2025–Jan 10th, 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 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.

Regions

Glacier.

With new snow and SW wind gusting to strong on Friday, you can expect that we will see an increase in natural avalanche activity. Any new slabs will also be easier to trigger. Use caution in wind effected terrain.

Confidence

Low

Avalanche Summary

On Thursday, a few size 1-2.5 natural wind slabs & dry loose avalanches were observed from steep alpine terrain in the highway corridor.

On Monday, we observed a size 1.5 wind slab avalanche in the alpine above NRC gully on Macdonald West Shoulder, likely rider triggered.

Snowpack Summary

10-15 cm of new snow buried a weak interface which consists of widespread surface hoar present in the elevation band from ~1400 m to 2100 m and a thin sun crust on steep westerly aspects. Moderate southerly winds have redistributed this new snow in exposed terrain, loading north facing terrain.

Isolated wind slabs are buried by new snow. These can be found on all aspects in the alpine.

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

Weather Summary

A frontal system pushes light snow into the interior Friday with a drying trend into the weekend.

Tonight Cloudy w/clear periods. Alp Low -7, Ridge wind moderate. Freezing level (FZL) 800m.

Fri Flurries. 9cm. Alpine high -6. Wind SW 20, gusting to 60. FZL 1000m

Sat Cloudy w/flurries. Alpine high -7 °C. Ridge wind W 15-45. FZL 900m.

Sun Cloudy w/ sunny periods. Alpine high -10 °C. Ridge wind NW 10-20. FZL 500m.

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.
  • Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for slabs before you commit to it.

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.