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Archived

Avalanche Forecast

Dec 10th, 2018–Dec 11th, 2018
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
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
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.

Expect sluffing in steep terrain with last nights 5-10cm of new snow burying a surface hoar / sun crust layer.Winds will increase over the day with the potential to build new wind slabs.

Weather Forecast

Overcast with isolated flurries for the day and an alpine high of -6. Winds will gradually increase over the day reaching 20-35km/hr from the Southwest. Our region is lined up for two strong winter storms, the first arriving on Tuesday with 25cm forecasted and another 20-30cm on Thursday. Winds will be strong throughout the week.

Snowpack Summary

8cm of new snow overnight now buries the Dec 9 surface hoar which was found up to 10mm in sheltered areas.  The November 21st surface hoar is down 30-45cm and is most likely to be triggered on steep solar aspects, where it overlies a crust. The height of snow at Mt Fidelity is below average for this time of year; see the graph for more info.

Avalanche Summary

All is quiet on the avalanche front this past week, with no reports of new avalanches in the past 5 days. Groups have been riding steep, unsupported features on many aspects and only seeing minor surface sluffing... This will change with the incoming storm systems

Confidence

Avalanche Problems

Persistent Slabs

This layer can be found at all elevations, but is spotty in its distribution. It will be most reactive in wind loaded areas and on steep solar aspects where the surface hoar sits on a crust.
Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.Be careful of loose dry power sluffing in steep terrain..

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2.5