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Archived

Avalanche Forecast

Dec 1st, 2022–Dec 2nd, 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

Be aware of changing avalanche conditions throughout the day. Hazard will rise as storm snow accumulates.

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 please submit a MIN report!

Snowpack Summary

10 - 20 cm of snow will accumulate through the day Friday and add to the previous storm snow to create a 30-60 cm storm slab.

In open alpine and treeline areas, moderate winds are expected to create deep pockets of wind slab in lee areas.

By end of day Friday an average of 70-100 cm of snow can be found in the alpine, with wind-loaded areas up to 150 cm.

Every storm helps to creep the snowpack toward threshold for avalanches however some areas at treeline and most areas below treeline have yet to overcome ground roughness and remain below the threshold.

Weather Summary

Thursday night

Cloudy with light flurries starting after midnight, accumulating to a few cm by morning. Light south to southeast ridge winds. Alpine temperature of -5 and freezing levels at the valley bottoms.

Friday

Cloudy with flurries that increase in intensity throughout the day. Snow amounts total 10-15 cm by the evening. Moderate east ridge winds. Alpine temperatures hover around -5 and freezing levels rise to 300 m.

Snow continues through Friday night adding another 10 - 15 cm by Saturday morning.

Saturday

Scattered clouds clearing in the afternoon. Light southeast to east winds. Alpine temperature high of -1. Freezing levels rise to 600 m on the southern half of the island.

Sunday

Clear skies and light east winds. Alpine temperatures rise to +1 degree. Freezing levels 900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Adjust your travel plans accordingly to the changing conditions of elevation and time of day.
  • Watch for changing conditions today, storm slabs may become increasingly reactive.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Avalanche Problems

Storm Slabs

Storm slabs will build throughout the day on Friday as snow accumulates. Watch for changes in slab sensitivity on steep slopes where snow totals +20 cm.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2