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Avalanche Forecast

Archived

Mar 29th, 2023–Mar 30th, 2023

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Northeast winds may have created reactive wind slabs in areas where you may not typically see them.

Continue to make solid terrain choices.

Confidence

Moderate

Avalanche Summary

No new avalanche activity was reported since Friday.

If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

At higher elevations, winds that have switched from the southwest to the northeast earlier this week. You may find lingering wind slabs on all aspects.

Below the recent snow is a melt-freeze crust, existing on all aspects at treeline and below. The crust extends to mountain tops on sunny aspects. In north-facing high alpine terrain, the surface snow may have remained cold and dry.

The mid and lower snowpack consists of a number of old crusts and facetted snow that continue to be monitored, particularly in shallow snowpack areas.

Weather Summary

Wednesday Night

Clear with some clouds, no accumulation, winds west and southwest 15 km/h, freezing levels up to 2000 m.

Thursday

A mix of sun and cloud, potential trace accumulation late in the day, winds west 15 to 20 km/h, freezing levels up to 1600 m.

Friday

Cloudy, up to 8 cm accumulation, winds southwest 25 km/h gusting to 50, freezing levels 1200 m.

Saturday

Cloudy, up to 15 cm accumulation overnight and throughout the day, winds southwest 25 to 35 km/h, freezing level at 1000 m.

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.
  • Avoid exposure to slopes that have cornices overhead.
  • Make observations and assess conditions continually as you travel.

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.