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Avalanche Forecast

Archived

Mar 13th, 2022–Mar 14th, 2022

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

Regions

South Coast.

Heavy snowfall builds deep and reactive storm slabs over a slick crust.

Avoid avalanche terrain. Choose simple, low-angle, well-supported terrain with no overhead hazard. 

Confidence

High - We are confident the likelihood of avalanche will increase with the arrival of the forecast weather.

Weather Forecast

Sunday night: Snowfall 15-25 cm, 40-50 km/h southwest wind, alpine temperature -2 C. Freezing level 1300 m.

Monday: Snowfall 20-45 cm, 50-60 km/h southwest wind, treeline temperature -1 C. Freezing level 1300 m.

Tuesday: Snowfall 20-30 cm, 30-40 km/h southwest wind, treeline temperature -2 C. Freezing level 1200 m.

Wednesday: Mostly cloudy, 10-20 km/h southwest wind, treeline temperature -3 C. Freezing level 900 m.

Avalanche Summary

On Saturday, explosives and ski cuts produced size 1 loose dry avalanches. A few small to medium sized storm slabs were triggered by skiers, as reported in this MIN from Sky Pilot. Going forward, storm slabs will likely remain reactive as they increase in size through the storm.

Snowpack Summary

40-70 cm of new snow by the end of Monday brings storm totals to 70-120 cm over a hard melt-freeze crust that exists on all aspects up to 1500 m and to the mountain tops on sun-exposed slopes.

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

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Stick to simple terrain and be aware of what is above you at all times.

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.