Bulletin d’avalanche

Jasper

Dec 26 – 27, 2013Parks Canada

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Archivé · expiré 13 years ago

Danger d’avalanche

Thu

Fri

Alpin

3 · Marqué

Limite forestière

2 · Modéré

Sous la limite

1 · Faible

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Points saillants

A shallow snowpack, deep persistent slab and basal weakness have created a tricky start to the season - conservative route selection and avoidance of big terrain in the alpine is advised. Have a safe and happy holiday season!

Problèmes avalancheux

Wind Slabs
N
NE
E
SE
S
SW
W
NW
Alpin
Limite forestière
Sous la limite forestière
Probabilité
Unlikely - Possible
Taille
1–2
Winds continue to be primarily from the Southwest and will likely form new pockets of windslab in exposed areas above treeline.
Deep Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Alpin
Limite forestière
Sous la limite forestière
Probabilité
Possible
Taille
2–3
Variable distribution of a persistent slab near the bottom of a shallow snowpack. Although stubborn, if this slab is triggered it will result in a full depth avalanche running on weak layers at or near the bottom of the snowpack.

Weather Forecast

Mild temperatures with minimal precipitation expected over the next few days. Winds to remain light to moderate from the SW. Freezing level around 1000m.

Snowpack Summary

Variable snow distribution at treeline and above. Wind slabs continue to develop in lee terrain features. Wind slab buried by recent light snow overlies a facetted snowpack and multiple early season crusts. The crusts are distributed unevenly in the forecast area. Facets and depth hoar are just off the ground. This weak base will persist longterm.

Avalanche Summary

Sunday observed several size 2's, likely solar initiated, on cross-loaded gullies above the weeping wall on Mt. Cirrus. They stopped mid-path. Saturday, we observed 2 size 3 avalanches on east facing cross-loaded alpine bowl near Mt. Saskatchewan/Wilson area, 2 size 2.5 on a similar aspect in the Winston Churchill range.

Confidence

Régions couvertes

Jasper