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Avalanche Forecast

Archived

Dec 20th, 2018–Dec 21st, 2018

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

If you make it to treeline or alpine terrain, be observant of recent storm snow amounts. Expect the deepest and touchiest snow deposits adjacent to ridges.

Confidence

Moderate - Due to the number of field observations.

Weather Forecast

THURSDAY NIGHT: Mostly cloudy with light snowfall, accumulation 5 to 10cm, freezing level dropping from 1000m to 500m. FRIDAY: Sunny with afternoon clouds, moderate west winds, treeline temperature -4°c, freezing level 600m. SATURDAY: Cloudy with snowfall, accumulation 10 to 15cm, moderate to strong southwest winds, treeline temperature -2°c, freezing level 900m. SUNDAY: Cloudy with snowfall, accumulation 40cm, moderate to strong southwest winds, treeline temperature 0°c, freezing level 1200m.

Avalanche Summary

No new reports of avalanches in the region. In the neighbouring Sea to Sky region, many natural and explosive-controlled avalanches have been reported through the last several days. Similar avalanche activity is likely to be found at high elevations in the South Coast region.We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Thursday's precipitation fell as rain at most elevations except for in the alpine near Squamish. Expect to find rain-soaked snow to treeline and storm snow up to 100 cm thick and even deeper in wind-loaded terrain features in the high alpine. Snow depths are over 200 cm in the alpine.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.