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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.
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.

Regions

Sasquatch, Sasquatch, Coquihalla, Harrison-Fraser, Manning, Skagit.

Watch for signs of instability throughout the day as temperatures continue to rise well above 0 °C. Be careful with sluffing in steep terrain, especially above cliffs and terrain traps.

Confidence

Moderate

Avalanche Summary

Several natural, size 1, loose wet avalanches were observed on all aspects on Sunday.

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

10 to 25 cm of storm snow sits overtop a widespread thick rain crust. Below the crust, the snowpack is generally well consolidated.

Overall, the snow depth remains relatively shallow, creating challenging travel conditions and numerous hazards at or just below the snow surface across all elevations.

Weather Summary

Monday Night

Mainly clear with no precipitation, northwest alpine winds 10 km/h, treeline temperature -1 °C, freezing level 1000 m.

Tuesday

Clear skies with no precipitation, southwest alpine winds 20 to 30 km/h, treeline temperature 0 °C. An above freezing layer will build this afternoon and be present through the night from 1700 to 3000 m.

Wednesday

Mix of sun and cloud with no precipitation, southwest alpine winds 40 to 70 km/h, treeline temperature +1 °C, the above freezing layer remains present through the day, 1700 to 3000 m.

Thursday

Cloudy with scattered flurries 2 to 5 cm accumulation, northwest alpine winds 30 to 40 km/h, treeline temperature -2 °C, freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for unstable snow on specific terrain features, especially when the snow is moist or wet.
  • 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

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.