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Archived

Avalanche Forecast

Dec 16th, 2019–Dec 17th, 2019
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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.

Southerly winds overnight will have created slabs in the alpine. Expect rising danger during the day with increased winds, snowfall, and milder temps.

Weather Forecast

Mainly cloudy with flurries today. 5cm forecast today, with moderate SW winds, -11*C in the alpine. Tonight and tomorrow brings 15cm, moderate to strong SW winds, and warmer temps (-6*C in alpine). Wed brings a mix of sun/cloud, trace snow, and continued moderate SW winds.

Snowpack Summary

20+ cm of new snow now buries the Dec 11 surface hoar layer. Moderate S'ly winds are building pockets of soft storm slab in the Alpine. The Nov 23rd surface hoar/crust/facet combo is down +/-100cm (SH is most prevalent in sheltered treeline locations) but has become increasingly stubborn in testing. The mid-lower snowpack is settled and strong.

Avalanche Summary

Isolated natural avalanche activity was noted on the Macdonald gullies yesterday. Suspect with the increased S'ly winds overnight that natural activity has increased from steep N aspects (Macdonald gullies and Cheops). A skier-controlled sz 1.5 in loose, unconsolidated snow from a N aspect was observed in the Sir Donald area yesterday.

Confidence

Avalanche Problems

Storm Slabs

Up to 20 cm of new snow since Dec 11th with light to moderate southerly wind. Expect reactive pockets of storm slab in wind exposed features.

  • Use caution above cliffs and terrain traps where small avalanches may have severe consequences.
  • Watch for fresh storm slabs on exposed lee slopes at and above treeline.

Aspects: North, North East, East, South East, West, North West.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Loose Dry

Surface snow will be prone to sluffing, especially on steep, unsupported aspects.

  • Be cautious of sluffing in steep terrain, particularly where the debris flows into terrain traps.
  • Use caution above cliffs where small avalanches may have severe consequences.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2