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Avalanche Forecast

Archived

Dec 19th, 2022–Dec 20th, 2022

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Assess for changing weather conditions. Snowfall during the day may exceed forecast amounts in regions along the US border. While recently formed wind slabs may take some more time to bond to the underlying, firm surfaces.

Confidence

Moderate

Avalanche Summary

A few small wind slab releases have been reported over the weekend through the MIN.

If you head out into the mountains, please share your photos or observations on the Mountain Information Network. Your information helps us understand local conditions!

Snowpack Summary

Surface: Up to 30cm of snow since Saturday, which continues to be redistributed by mostly Northeasterly winds.

Upper snowpack: New snow has buried various firm, previously wind-affected surfaces. In sheltered terrain at lower elevations, the new snow overlays large surface hoar and a sun crust on solar aspects.

Mid snowpack: Generally bonding and well-settled.

Lower snowpack: Consists of numerous crusts and facets layers. A layer of note, buried in late November continues to show isolated reactivity in test profiles.

Snowpack depth at treeline is around 200 cm deep but decreases rapidly below 1500 m.

Weather Summary

Monday night

Cloudy with a trace of snow by the morning. Light to moderate Southwest winds and temperatures around -20 C in the alpine.

Tuesday

Cloudy with snow throughout the day. Amounts generally range from 10 to 20 cm. Areas closest to the USA border could potentially see up to 30 cm. Light to moderate Southwest winds and temperatures around -15 to -25 C in the alpine.

Wednesday

Sunny, with no precipitation. Temperatures -20 to -30 C and Moderate to strong Easterly winds in the alpine.

Thursday

Sunny with periods of cloud. No Precipitation. Temperatures -20 to -30 C and moderate Easterly winds in the alpine.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.

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.