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Avalanche Forecast

Archived

Nov 27th, 2024–Nov 28th, 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, Manning, Skagit.

Seek out sheltered powder for better, safer riding. Put your guard up if you encounter signs of recent wind slab formation and while you navigate areas of thin coverage.

Confidence

Low

Avalanche Summary

We have not had any reports of avalanche activity.

Please consider sharing any observations you have on the Mountain Information Network.

Snowpack Summary

Up to 5 cm of new snow from Tuesday night may have given a thin cover to a new layer of surface hoar. This grain hasn't been reported in the Cascades yet but has been growing vigourously in adjacent regions.

Below the surface, 10 - 15 cm of soft snow may still exist on sheltered, shaded slopes. In most other areas, especially the alpine, this snow has been heavily wind-redistributed. Cold temperatures are now faceting this upper layer, causing snow grains to lose cohesion.

Various melt-freeze crusts exist in the bottom half of the snowpack but do not appear to be avalanche concerns.

Around 100 cm of snow can be found at treeline. This diminishes rapidly below about 1500 m, where a surface crust is present.

Weather Summary

Wednesday night

Cloudy with isolated flurries. 25 to 30 km/h west ridgetop wind. Freezing level 700 m.

Thursday

Cloudy with isolated flurries. 25 to 30 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 900 m.

Friday

Cloudy with isolated flurries, increasing a bit overnight. 35 - 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 700 m.

Saturday

Cloudy with easing flurries and new snow totals up to 5 cm. 30 - 35 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Wind slabs are most reactive during their formation.

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.