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Avalanche Forecast

Archived

Mar 11th, 2022–Mar 12th, 2022

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 and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

South Coast.

Avalanche danger will increase as new snow and wind form fresh slabs that may slide easily on a slippery crust.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

Friday night: Cloudy with snowfall, accumulation 10-15 cm, 30-40 km/h southwest wind, treeline temperature -3 C, freezing level 500 m.

Saturday: Cloudy with snowfall, accumulation 5-10 cm, 30-40 km/h southwest wind, treeline temperature -1 C. Freezing level 1300 m.

Sunday: Overnight snowfall around 5 cm then cloudy with sunny periods, 10-20 km/h southwest wind, alpine temperature -1 C. Freezing level 1300 m.

Monday: Cloudy with snowfall, accumulation 40-60 cm, 60 km/h southwest wind, treeline temperature -1 C. Freezing level 1500 m.

Avalanche Summary

No recent avalanches were reported. Avalanche activity will increase in the coming days as new slabs form. The snow may remain quite reactive if it doesn't bond well to the melt-freeze crust.

Snowpack Summary

New snow falls with strong southwest wind. Storm totals of 15-25 cm are expected by Saturday evening in most areas. The snow falls on a hard melt-freeze crust on all aspects up to 1500 m and to the mountain tops on sun-exposed slopes. The snow falls on variable wind-affected snow on northerly aspects above 1500 m.

A few other melt-freeze crusts are found in the top 100 cm of the snowpack but appear to be progressively bonding.

The remainder of the snowpack is well-bonded.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Watch for avalanche hazard to increase throughout the day.
  • Large cornice falls are dangerous on their own.

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.