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Avalanche Forecast

Archived

Mar 2nd, 2023–Mar 3rd, 2023

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

Regions

Glacier.

Rider triggered avalanches are likely, especially on wind loaded features.

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

Confidence

Moderate

Avalanche Summary

A small natural avalanche cycle was observed from steep terrain on Thurs along the hwy corridor with storm slab avalanches up to size 3 terminating at the beginning of runouts. A field team triggered a sz 1 avalanche failing on the previous storm interface ~50cm deep.

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 may continue to.

Snowpack Summary

20-25cm of new snow, accompanied by moderate to strong SW winds fell on Thurs. This new snow covers old wind slabs 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

A cold front passed over the park overnight leaving an unstable airmass with scattered convective flurries in its wake.

Fri: Cloudy w/ sunny periods, trace of new snow, strong SW winds, Alp high -12*C, freezing level 500m

Sat: Mix of sun & cloud w/ a trace of new snow, light E winds, Alp high -10*C, freezing level 900m

Sun: Mix of sun & cloud, light E winds, Alp high -13*C, freezing level 700m

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.