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Avalanche Forecast

Archived

Dec 20th, 2024–Dec 21st, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

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

Keep an eye on changing conditions throughout the day and be prepared to dial back your objectives.

Storm slabs could increase in size and sensitivity throughout the day.

Confidence

Moderate

Avalanche Summary

No new avalanches were observed in this region on Thursday.

Many natural and explosive triggered storm slab avalanches up to size 2.5 were reported on Wednesday. The majority of these avalanches occurred at treeline however a few occurred in the alpine. Avalanches were observed on all aspects.

Snowpack Summary

Up to 15 cm of new snow may have fallen by 4 pm on the 21st. This new snow will be accompanied by strong southerly winds which will form deeper deposits on northerly aspects.

A crust or moist snow will be observed on the surface at lower elevations.

A prominent crust with facets above from early December is down 80 to 140 cm at treeline. A layer of surface hoar may be found in sheltered areas at treeline at this depth.

The lower snowpack is well-settled with no layers of concern.

Weather Summary

Friday NightA mix of cloud and clear skies with up to 5 mm of mixed precipitation. 30 to 50 km/h southeast ridgetop wind. Freezing level around 1800 m.SaturdayCloudy with 10 to 15 mm of mixed precipitation. 40 to 60 km/h southeast ridgetop wind. Freezing level around 1900 m.

Sunday

Mostly cloudy with 5 to 10 cm of snow. 40 to 70 km/h southeast ridgetop wind. Freezing level falling to 1400 m.

Monday

Mostly cloudy with around 5 cm of snow. 20 to 40 km/h southeast ridgetop wind. Treeline temperature -1 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Be careful as you transition into wind-affected terrain.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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.