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Avalanche Forecast

Archived

Dec 6th, 2024–Dec 7th, 2024

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

Regions

North Rockies, McBride, Premier, Sugarbowl, Kakwa, McGregor, Pine Pass, Renshaw, Robson.

Choose small, low consequence slopes.

New storm and wind slabs will likely be reactive to rider traffic.

Confidence

Low

Avalanche Summary

No significant avalanches were reported.

Observations remain limited this early in the season. If you head into the backcountry, please post to the Mountain Information Network.

Snowpack Summary

By the morning of December 7th 15 to 30 cm of storm snow may have fallen. This new snow will be accompanied by strong southwest wind forming deeper deposits on north and east aspects. Moist snow from recent rain and warm temperatures can be found below. At lower elevations this precipitation will likely be rain, further saturating the upper pack.

The lower snowpack contains a crust from early-November, possibly with weak facets around it. Its distribution and reactivity are unclear, and it is uncertain if avalanches are failing on this layer.

Treeline snow depths range from 60 to 200 cm.

Weather Summary

Friday Night

Cloudy with up to 15 cm of snow expected, except for the eastern slopes where trace amounts are expected.  Rain below treeline. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -1 °C.

Saturday

Cloudy with 5 to 20 cm of snow in most areas, with 1 to 3 cm of snow on the eastern slopes. Rain is expected below treeline. 40 to 60 km/h southwest ridgetop wind. Treeline temperature around -1 °C.

Sunday

Mix of sun and cloud with 1 to 3 cm of snow possible. 20 to 40 km/h west ridgetop wind. Treeline temperature -4°C.

Monday

Cloud clearing throughout the day with no snow expected. 15 to 30 km/h west ridgetop wind. Treeline temperature -6°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

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.