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Archived

Avalanche Forecast

Nov 30th, 2022–Dec 1st, 2022
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

The strong winds that accompanied yesterday's sea-level snowfall have wind-sculpted upper elevations in many areas. If you do venture up high, use ribs and high terrain to avoid pockets of wind slab.

Enjoy the low-elevation snow, but remember what hazards lurk below it!

Confidence

Low

Avalanche Summary

Observations are limited at this time of year. No new avalanches have been reported or observed. If you do head into the backcountry consider submitting a MIN report!

Snowpack Summary

Tuesday night's storm brought 20-40 cm of new snow to higher elevations accompanied by strong to extreme southerly winds. Tapering snowfall amounts at lower elevations blanketed the island with up to 30 cm of new snow accumulation down to sea level.

In open alpine and treeline areas, strong winds are expected to have created deep pockets of wind slab in lee areas and stripped windward areas back down to the ground or an icy crust.

.An average of 60-80 cm of snow can be found in the alpine, with wind-loaded areas up to 150 cm.

Most areas below treeline have yet to overcome ground roughness and remain below the threshold for avalanches.

Weather Summary

Wednesday night

Partially cloudy, isolated flurries. Freezing level drops to valley bottom, low temperature of -12 C at treeline. 10-25 km/h northeast winds.

Thursday

Mainly clear, but some isolated lingering flurries. High clouds increase in the afternoon. Freezing level remaining at valley bottom. A daytime high temperature of -5 C at treeline. 5-15 km/h northerly winds.

Friday

Cloudy with snowfall, 5-15 cm accumulation. Freezing level rises to 300m. A daytime high temperature of -3 C at treeline. 30-70 km/h southerly winds.

Saturday

Cloudy with snowfall in the morning, clearing into the afternoon. 1-5 cm of accumulation expected. Freezing level rises to 800m. A daytime high temperature of +1 C at treeline. 20-35 km/h easterly winds.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for areas of hard wind slab on alpine features.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Avalanche Problems

Wind Slabs

Recent snowfall and strong southerly winds may have created deep deposits of wind slabs in lee areas. These wind-hardened slabs are most likely to be found behind corniced ridge lines, below cliff bands, and in steep gully features.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2