Avalanche Bulletin - Sea to Sky

Date Issued:

Valid Until:

Forecaster:ahanna

A dusting of new snow falls ontop of generally firm, crystal-covered surfaces. It may seem harmless now but as more snow gradually accumulates, this interface is expected to become problematic in the long term. So enjoy the fast travel and good stability while you can.

Sun, 24 JanMon, 25 JanTue, 26 Jan
Alpine1 Low2 Moderate3 Considerable
Treeline1 Low2 Moderate2 Moderate
Below Treeline1 Low2 Moderate2 Moderate
Confidence: High

Travel and Terrain Advice

Cornice

Minimize exposure to slopes with cornices overhead and stay well back of them when travelling on ridges.

Forecast Details

Avalanche Summary

No new reports in the last few days. Explosive control work targeting cornices on Thursday produced size 1.5 results and did not trigger slabs in the slopes below. This indicates an improvement in stability since last weekend, when similar work produced size 2 results, some triggering deep slabs on the rocky slopes below. 

Earlier this month, we saw significant deep persistent slab activity, both natural and human triggered. Deep glide cracks have also been observed previously but appear to be holding together in the cool temperatures.

Snowpack Summary

A dusting of new snow falls on generally hard surfaces throughout the region; old stiff wind slab at upper elevations and a crust below 1900 m and on south aspects. In the recent cool, clear weather, crystals such as surface hoar and facets have formed ontop of these old surfaces. They are expected to become problematic as snow accumulates overtop.

Remnants of a melt-freeze crust from early December may be found around 200 cm deep in the snowpack. In shallow rocky snowpack spots, it still shows some propagation and collapse to moderate to hard loading in the most recent snowpack tests. In thicker snowpack areas it has shown no results, and appears to be trending dormant... for now at least.

Weather Forecast

Freezing levels at valley bottom.

Saturday night: Increasing cloud with flurries starting, up to 5 cm, light to moderate westerly wind, alpine temperature -9.

Sunday: Flurries up to 5 cm, light westerly wind, alpine high -9.

Monday: Flurries up to 5 cm, light southerly wind, alpine high -10.

Tuesday: Flurries up to 5 cm, moderate southeast wind, alpine high -12.