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Avalanche Forecast

Archived

Mar 3rd, 2023–Mar 4th, 2023

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

Glacier.

Natural avalanche activity may have tapered off but human triggering remains possible, expect reactive slabs in the alpine.

Give the new snow time to bond, start conservatively and watch for signs of instability before increasing your exposure.

Confidence

Moderate

Avalanche Summary

Thursday a small natural avalanche cycle was observed up to sz 2.5, Friday a few natural avalanches up to sz 3 were observed from steep rocky terrain within the hwy corridor.

A rider triggered a sz 2.5 avalanche on Bruins Ridge on Monday. This feature has avalanched 3 times this winter on basal facets and shows the potential of triggering the deep persistent weakness in shallow areas.

Snowpack Summary

60-75cm of new snow fell this week with mod-strong SW winds forming storm slabs that sit over old wind slabs and wind affect in exposed areas, breakable crust on steep solar aspects and settled snow in sheltered areas.

The mid snowpack is generally strong while the deep persistent weakness remains, this consists of rounding facets and a decomposing crust in some locations.

Weather Summary

Convective activity will continue bringing a mix of sun and cloud with flurries to start the weekend before a calm drier trend begins for next week.

Sat: Cloudy w/ a trace of new snow, light E winds, Alp high -10*C, freezing level 700m

Sun: Mix of sun & cloud, light SE winds, Alp high -11*C, freezing level 400m

Mon: Mix of sun & cloud w/ a trace of new snow, light SE winds, Alp high -9*C, freezing level 1000m

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Start with conservative lines and watch for clues of instability.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.