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Archived

Avalanche Forecast

Jan 17th, 2018–Jan 18th, 2018
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
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Conservative terrain choices are still required given current conditions.

Weather Forecast

Cloudy with sunny periods and a trace of snow and an alpine high of -2C today. Tonight through Thursday the forecast calls for upwards of 30cm of storm snow with gusty moderate to strong SW winds and alpine temperatures of -3C.

Snowpack Summary

10cm storm snow overnight with mod-strong S'ly winds have formed new thin storm slab on alpine and treeline lee features. This adds load to the previous storm slab over persistent weak layer condition that formed over the last 10 days. The Jan 4th, Dec 15 surface hoar layers are down ~60cm and ~90cm. Both layers are producing sudden planar results.

Avalanche Summary

Limited natural avalanche activity through the highway corridor and no new slides reported or observed in the back country yesterday.

Confidence

Forecast snowfall amounts are uncertain on Thursday

Avalanche Problems

Persistent Slabs

The Jan 4 and Dec 15 surface hoar layers are down ~65cm and ~95cm respectively. These layers are widespread at treeline. 10cm storm snow in the last 24hrs will add load to the slab over these weak layers.
Watch for whumpfing, hollow sounds, and shooting cracks.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Storm Slabs

10cm of storm snow accompanied by mod-strong S'ly winds have formed fresh storm slab at and above treeline. These slabs reside on a variety of surfaces such as small surface hoar, temperature crust and sun crust.
If triggered the storm slabs may step down to deeper layers resulting in large avalanches.Be wary of slopes that did not previously avalanche.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2