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Archived

Avalanche Forecast

Jan 16th, 2018–Jan 17th, 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
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
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.

The persistent weak layers in the snowpack remain susceptible to human triggering.

Weather Forecast

Mainly cloudy with scattered flurries and around 4cm of snow today. A pending storm system will bring snowfall with upwards of 30cm expected by Friday afternoon. The avalanche danger will increase with this new snow load on the persistent weak layers.

Snowpack Summary

70cm of storm snow has settled into a slab over a series of persistent weak layers. The Jan 4th & Dec 15 surface hoar layers are down around 60cm and 90cm. The combination of load and a temperature inversion made these layers reactive over the last several days. These layers remain reactive with sudden planar results and potential for propagation.

Avalanche Summary

Seven new natural avalanches to size 2.5 recorded in the highway corridor yesterday off of steep south facing terrain. No new slides observed or recorded in the back country yesterday.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

The Jan 4 and Dec 15 surface hoar layers are down ~60cm and ~90cm respectively. These layers are widespread at treeline. A receding weak temp inversion and mainly cloudy conditions should reduce reactivity compared to recent days.
Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3