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Avalanche Forecast

Archived

Dec 7th, 2023–Dec 8th, 2023

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

Regions

Northwest Inland, Kispiox, Microwave-Sinclair, Ningunsaw, Ningunsaw, Ningunsaw, North Bulkley, South Bulkley, South Bulkley, South Bulkley, Telkwa.

Fresh storm snow sits on a reactive and widespread layer of surface hoar.

Be cautious around roll-overs, especially in wind-loaded areas.

Confidence

Moderate

Avalanche Summary

Evidence of a natural avalanche cycle (up to size 2.5) from the recent storm was reported in the Hudson Bay Range. On Wednesday, debris of wet loose, wind and storm slab avalanches were observed depending on aspects and elevations.

If you do go into the backcountry, consider submitting a Mountain Information Network report.

Snowpack Summary

30 to 60 cm of recent snow sits above a large layer of surface hoar. This layer likely exists on all aspects above 1200 m. Below this elevation a crust exists on all aspects.

In general, the snowpack is still shallow for this time of year with snowpack depths at treeline ranging from 50 to 150 cm. Early season hazards are still a concern.

Weather Summary

Thursday Night

Mostly clear, no new snow expected, southwest alpine wind 15 to 35 km/h, treeline temperature -6°C.

Friday

A mix of sun and cloud with no new snow expected, southwest alpine wind 15 to 35 km/h, treeline temperature -6°C.

Saturday

Cloudy with around 5 cm of new snow expected, south alpine wind 40 to 60 km/h, treeline temperature -2°C.

Sunday

A mix of sun and cloud with no new snow expected, west alpine wind 25 to 60 km/h, freezing level rising to 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.
  • Closely monitor how the new snow is bonding to the old surface.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

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.