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Avalanche Forecast

Archived

Nov 30th, 2024–Dec 1st, 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.

Watch for wind-loaded pockets as this is where you'll trigger an avalanche.

Confidence

Low

Avalanche Summary

A few small (size 1) human-triggered wind slab avalanches were reported in the alpine on Friday by our neighbours in the USA. They seem to be running on a crust, that may have weak facet crystals above.

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

Snowpack Summary

Saturday's small amount of new snow adds to any wind loading that occurred on Friday loading a buried crust; possibly with small, weak facets on top. This caught riders off guard on Friday.

The bottom of the snowpack contains several crusts that have not been a concern.

Around 100 cm of snow can be found at treeline. This diminishes rapidly below about 1500 m.

Weather Summary

Saturday Night

Cloudy. 20 to 30 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

Sunday

Mostly sunny. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level 2700 m.

Monday

Sunny. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 4 °C. Freezing level 3200 m.

Tuesday

Sunny. 10 to 20 km/h southwest ridgetop wind. Treeline temperature 4 °C. Freezing level 3200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Carefully evaluate steep lines for wind slabs.
  • 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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.