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Avalanche Forecast

Archived

Apr 10th, 2022–Apr 11th, 2022

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

Evaluate steep lines for wind slabs.

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

SUNDAY NIGHT: Cloudy with snowfall then clearing, accumulation 1 to 3 cm, 30 to 40 km/h northeast wind, alpine temperature -10 C.

MONDAY: Clear skies with no precipitation, 10 to 30 km/h northeast wind, alpine temperature -9 C.

TUESDAY: Cloudy with snowfall, accumulation 5 to 15 cm, 20 km/h northeast wind, alpine temperature -10 C.

WEDNESDAY: Mix of sun and cloud with isolated flurries, accumulation 2 to 5 cm, 10 km/h northeast wind, alpine temperature -9 C.

Avalanche Summary

Explosives triggered cornices along ridgelines. Otherwise, no recent avalanches were observed.

Looking forward, wind slabs could be triggered by riders out of steep terrain. Use caution on sun-exposed slopes and near cornices during the heat of the day, when resulting avalanches are more likely.

Snowpack Summary

10 to 20 cm of dry, wind-affected snow sits above a hard melt-freeze crust in the alpine. Wind slabs could form in lee terrain features in the alpine from strong northeast wind. A surface melt-freeze crust is found at treeline and below, which may moisten during daytime heating.

A melt-freeze crust that formed late March to early April is found 60 to 100 cm deep. Avalanches were sliding on this layer last week, but activity has since decreased. The likelihood of triggering this layer is low given the cool weather.

There are no deeper concerns at this time.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Minimize exposure to steep, sun exposed slopes, especially when the solar radiation is strong.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.