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Avalanche Forecast

Archived

Dec 6th, 2023–Dec 7th, 2023

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.

Regions

North Columbia, South Columbia, Blue River, Clearwater, Esplanade, Jordan, North Monashee, North Selkirk, West Purcell, Badshot-Battle, Central Selkirk, Goat, Gold.

Keep decision making conservative, especially in areas that received no rain.

Fresh snow sits over a weak and reactive surface hoar layer. Head to simple terrain, free from overhead hazard.

Confidence

Moderate

Avalanche Summary

A widespread natural cycle occurred yesterday, with storm slabs to size 2, and wet avalanches where rain saturated the snowpack. Avalanches ran on a buried surface hoar layer or on the old snow interface. Several large remotely triggered avalanches were reported on the buried surface hoar, indicating very touchy conditions.

Activity is expected to decrease as it cools, and surface crusts form from the recent rainfall.

Snowpack Summary

By Thursday morning around 50 mm of precipitation (rain and/or snow) has fallen during this storm. At higher elevations, deeper and more reactive slabs can be found north and east-facing slopes. This snow likely sits over a crust from rainfall at lower elevations in all areas, and where rain fell at higher elevations.

The layer of greatest concern, large surface hoar, can be found buried 30-70 cm deep. On steep south-facing slopes, this surface hoar sits on a thin sun crust.

The mid-pack is generally well-settled. Lower in the snowpack a crust with weak facets beneath it can be found 20 cm off the ground.

Weather Summary

Wednesday Night

Cloudy with freezing levels between 1000-1500 m. 10-25 cm of snow is possible above, favouring the West Purcells and terrain south of Highway one. Southwesterly winds, 15-30 km/h.

Thursday

Mostly cloudy, up to 10 cm of snow is possible in the east of the region as the front exits. Freezing levels sit around 1000, treeline temperatures around -5 °C.

Friday

Freezing levels drop to valley bottom. A mix of sun and cloud, with westerly winds 10-30 km/h. No snowfall expected. Treeline temperatures around -8 °C.

Saturday

A mix of sun and cloud with light snowfall possible. Freezing levels sit at valley bottom, treeline temperatures around -8 °C. Southwest winds increase to 60 km/h.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.

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.