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Archived

Avalanche Forecast

Jan 10th, 2018–Jan 11th, 2018
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
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Buried old wind slabs (persistent slab) vary in reactivity and warrant a site by site assessment.

Weather Forecast

An arctic front has pushed the jet stream to our south.  Cold air and L winds will persist through Thursday.Thursdays forecast is for a mix of sun and cloud, alpine lows -18C, highs -14 C, and light wind. A ridge sliding in from the Coast will give warming temps and light W winds in to the weekend.

Snowpack Summary

Up to 15cm of snow (3 days), sits on pockets of old wind slab in exposed areas (these sit on weak facets and srfce hoar many locations), and a facetted upper snowpack in sheltered areas at all elevations. A strong mid snowpack crust is providing some strength around treeline. The faceting process (weakening) is well underway in the lower snowpack.

Avalanche Summary

No new avalanches observed or reported.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

New snow covers pockets of old wind slabs on a weak interface in exposed alpine and TL features. Bigger, uniform features have the potential to trigger large avalanches and should be treated with caution.
Approach steep lee and cross-loaded slopes with caution.Be careful with wind loaded pockets while approaching and climbing ice routes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

New snow covers a facetted/weak upper snowpack in sheltered areas. Be cautious in very steep terrain and in confined features where a small sluff could build mass.
Use caution above ledges and cliffs where small avalanches may have severe consequences.The shallow, weakening snowpack makes for difficult trail breaking at low elevations.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2