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Avalanche Forecast

Archived

Dec 11th, 2023–Dec 12th, 2023

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

Sea To Sky, Brandywine, Garibaldi, Homathko, Spearhead, Tantalus, Sky Pilot.

Use caution in wind-loaded areas in the alpine where snow remains dry and wind slabs linger.

Confidence

Moderate

Avalanche Summary

On Sunday explosives control in the region produced numerous storm slab avalanches up to size 2.

On Saturday, storm slabs were reactive to skier triggering with several, size 1 to 1.5 avalanches being reported. Storm snow was particularly reactive in wind loaded ridgetop terrain.

Thank you to everyone who has been sharing observations on the Mountain Information Network. All the information and photos are very appreciated by forecasters!

Snowpack Summary

15-20 cm of recent snow and strong southerly winds have built pockets of cohesive slab in the alpine. This overlies a melt freeze crust and in sheltered areas a layer of weak surface hoar.

Below 1900m snow surface is moist. 50 cm down is a thick widespread supportive crust.

Overall, the snow depth remains relatively shallow, with numerous hazards present at or just below the snow surface across all elevations.

Weather Summary

Monday Night

Clear skies with no precipitation, northwest alpine winds 15 km/h, treeline temperature 0 °C, freezing levels 1700 m.

Tuesday

Mainly sunny with no precipitation, southwest alpine winds 30 to 40 km/h, treeline temperature +1 °C, freezing levels rise to 2200 m by afternoon.

Wednesday

Cloudy with flurries, 5 to 15 mm accumulation, southwest alpine wind 60 to 80 km/h, treeline temperature -2 °C, freezing level 1200 m.

Flurries continue overnight bringing another 10 to 15 mm of accumulation.

Thursday

Mainly cloudy with isolated flurries, trace accumulation, northwest alpine wind 15 to 30 km/h, treeline temperature -4 °C, freezing level 800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

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.