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Avalanche Forecast

Archived

Mar 9th, 2023–Mar 10th, 2023

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

Regions

Crowsnest North, Crowsnest South.

Watch for freshly wind-loaded slopes in the alpine.

Confidence

High

Avalanche Summary

A few small loose avalanches were observed on sun-exposed slopes over the past few days. On Monday, a natural, size 2 avalanche was reported in steep, rocky terrain on an east aspect. The avalanche was likely triggered by a cornice failure due to solar radiation.

Snowpack Summary

5 to 15 cm of new snow is expected by Friday evening, with deeper wind deposits possible in the alpine. This snow will bury a sun crust on steep solar slopes.

A melt-freeze crust with facets above sits 50 to 120 cm deep. It has not produced any avalanches in the region, however professionals are still tracking it to watch for signs of it becoming an active problem.

The mid to lower snowpack is considered well bonded at this point. Currently, we are not seeing the same basal weak layers and reactivity that many of the neighboring regions are experiencing this season.

Weather Summary

Thursday night

Increasing cloud, no precipitation, 20 km/h southeast wind, treeline temperatures cool to -18 °C.

Friday

Cloudy with scattered flurries, 5 to 10 cm of snow with some areas near the US border getting up to 15 cm, 30 to 50 km/h southeast wind, treeline temperatures around -15 °C.

Saturday

Mix of sun and cloud with some isolated flurries bringing trace amounts of snow, 15 km/h southwest wind, treeline temperatures reach -10 °C.

Sunday

Mix of sun and cloud, 15 to 30 km/h southwest wind, treeline temperatures reach -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Make observations and assess conditions continually as you travel.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

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.