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Avalanche Forecast

Archived

Mar 13th, 2021–Mar 14th, 2021

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

Regions

Sea To Sky.

Storm and wind slabs are expected to build over the day as a storm impacts the region. Treat the danger as HIGH if 25 cm of snow or more accumulates in your riding area.

Confidence

Moderate - Uncertainty is due to the track & intensity of the incoming weather system.

Weather Forecast

SATURDAY NIGHT: Increasing clouds, 40 to 60 km/h southwest wind, alpine temperature -5 C, freezing level 1500 m.

SUNDAY: Cloudy with snowfall, accumulation 10 to 20 cm with local amounts up to 30 cm possible west, 40 to 60 km/h south wind, alpine temperature -6 C, freezing level 1000 m.

MONDAY: Mix of sun and cloud, 20 km/h northeast wind, alpine temperature -5 C.

TUESDAY: Mostly cloudy, 20 km/h southwest wind, alpine temperature -4 C.

Avalanche Summary

Loose wet activity and some cornice failures have likely occurred in the past few days from spring-like conditions. Looking forward, storm and wind slabs are likely to be triggerable on Sunday as they build during and after the storm. Loose wet avalanche activity may continue below the rain-snow line.

Snowpack Summary

A storm will impact the region on Sunday, bringing snow above around 1000 m, and rain below. Storm slabs are expected to form over the day. Strong south wind will form wind slabs in exposed lee terrain features at treeline and alpine elevations. The snow will fall onto previously wet or crusty snow except at high elevation northerly aspects, where it should fall onto wind-affected snow in exposed terrain or perhaps small surface hoar crystals in sheltered terrain. Cornices have been reported as being massive and fragile.

Terrain and Travel

  • Wind slabs are most reactive during their formation.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Extra caution is needed around cornices under the current conditions.

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.