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Archived

Avalanche Forecast

Dec 26th, 2019–Dec 27th, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Blue skies, holidays, and fresh snow...it will be BUSY in Rogers Pass this week. Watch for people above and below you!

A persistent slab on surface hoar, down one metre, should be on everyone's mind as they plan their day. Choose conservative lines!

Weather Forecast

Sunny this morning with increasing clouds and isolated flurries this afternoon/evening. Light SW winds at ridge-top and an alpine high of -10*C. More of the same Friday and Saturday, with sun and cloudy periods, isolated flurries, light SW winds, and alpine temps ranging from -7 to -13*C.

Snowpack Summary

Last week's metre of snow is settling into a soft slab, especially near ridge crests. A thin sun crust exists on steep solar aspects. The Dec 11th SH (5-12mm) is well preserved and is now down 90-120cm. Early season crusts still persist in the lower snowpack.

Avalanche Summary

Several natural avalanches were observed from the steep, N-facing gullies on Macdonald yesterday, all running to the top of their respective fans. No new avalanches reported from the backcountry.

Confidence

Avalanche Problems

Persistent Slabs

We are entering a period of lower probability of triggering a slab, but a high consequence if you do. A 100cm slab sits on well-preserved, large surface hoar. This is a recipe for HUMAN-TRIGGERED avalanches.

  • Be wary of slopes that did not previously avalanche.
  • Use conservative route selection, stick to supported terrain features, avoid overhead hazards.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5