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Archived

Avalanche Forecast

Dec 4th, 2020–Dec 5th, 2020
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
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
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

A  temperature inversion will be warming the alpine today. Avalanche hazard will be highest on (or below) steep solar aspects.

Weather Forecast

A ridge of high pressure brings periods of sun today.  An established temperature inversion will keep things cold below treeline with an alpine high of + 3.0 C. Ridge winds SW 15-25km/h.  Temperatures (and avalanche hazard) will spike on Saturday with freezing levels climbing to 3400m. Seasonal weather returns on Monday with a cold winter storm.

Snowpack Summary

An overnight refreeze has left a crust on steep solar aspects in the alpine, which will break down by mid-day. Dry power sits on shaded aspects, though recent SW winds have created pockets of soft slab. Around TL there is a buried layer of surface hoar down 40cm. The Nov 5th crust is prominent, widespread, and sits under more than 1m of snow.

Avalanche Summary

No new avalanches were observed.

Confidence

Freezing levels are uncertain

Avalanche Problems

Loose Dry

Warm temperatures and sun may continue to produce loose activity. This will be most likely on steep S-SW aspects with rocky terrain features although the temperature inversion is heating up non-solar aspects as well

  • While traveling at lower elevations, pay attention to overhead avalanche paths this afternoon!
  • If triggered, loose wet sluffs may step down to deeper layers resulting in larger avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Warm temperatures yesterday did not produce natural activity on this layer but it is still within the triggerable range for a skier or rider in shallow areas.

  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3