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Avalanche Forecast

Archived

Dec 19th, 2024–Dec 20th, 2024

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Continuously monitor conditions as you move through terrain

Storm slabs may be more reactive at higher elevations

Confidence

Moderate

Avalanche Summary

Many natural and explosive triggered storm slab avalanches up to size 2.5 were reported on Wednesday. These avalanches occurred on all aspects at treeline and above.

A few of these avalanches had impressive propagation.

Snowpack Summary

the majority of this precipitation will likely fall as rain, saturating the upper snowpack. In the alpine most of this precipitation will fall as snow. This new snow will be  accompanied by southerly winds likely forming deep deposits on northerly aspects.

30 to 60 cm overlies a crust on south aspects and all aspects below 1800 m. A layer of surface hoar could be found just above this layer in sheltered terrain at treeline.

Snow depths at treeline are around 80-120 cm.

Weather Summary

Thursday NightCloudy with up to 15 cm of snow. 30 to 50 km/h south ridgetop wind. Treeline temperature -2 °C.FridayMostly cloudy with up to 10 mm of mixed precipitation. 30 to 50 km/h southeast ridgetop wind. Freezing level rising to 1800 m.

Saturday

Mostly cloudy with up to 5 mm of mixed precipitation. 25 to 50 km/h southeast ridgetop wind. Freezing level rising to 1900 m.

Sunday

Mostly cloudy with up to 5 cm of snow. 30 to 50 km/h southeast ridgetop wind. Freezing level around 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be careful as you transition into wind-affected terrain.
  • Be alert to conditions that change with aspect and elevation.

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.