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Avalanche Forecast

Archived

Feb 20th, 2024–Feb 21st, 2024

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

Coquihalla, Harrison-Fraser, Manning, Skagit.

Use caution in wind effected terrain, wind slab over facets, surface hoar or a crust remains the primary concern.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported in the past few days.

Snowpack Summary

New snow will accumulate over a variety of surfaces including; surface hoar in sheltered terrain, A crust on south aspects and all aspects below treeline and old wind effected surfaces in exposed terrain.

A widespread crust exists 25-40 cm below the surface, and surface hoar has been found above the crust in some parts of the region.

The remainder of the snowpack is well settled. Conditions remain rugged at lower elevations.

Weather Summary

Tuesday Night

Mostly cloudy with up to 5 cm of new snow expected in the alpine. 10 to 25 km/h southeast alpine wind. Freezing level around 1500 m.

Wednesday

A mix of sun and cloud with trace amounts of new snow expected in the alpine. 15 to 30 km/h southeast alpine wind. Freezing level rising to 1800 m.

Thursday

A mix of sun and cloud with trace amounts of new snow expected. 10 to 25 km/h southeast alpine wind. Freezing level rising to 1500 m.

Friday

Mostly sunny . 30 to 50 km/h southwest alpine wind. Freezing level rising to 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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.