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Avalanche Forecast

Archived

Jan 4th, 2019–Jan 5th, 2019

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

Regions

South Coast.

Avalanche hazard is highest at alpine elevations where snow has accumulated and been affected by the wind.

Confidence

Low - Due to the number of field observations

Weather Forecast

FRIDAY NIGHT: Cloudy with wet flurries, trace to 5 cm snow. Moderate southeast wind with strong to extreme gusts. Freezing level 1100 m and rising early morning.SATURDAY: Unsettled, cloudy with isolated showers, trace accumulation. Moderate south-southeast wind gusting to strong. Freezing level rising to 1500 m.SUNDAY: Snow, accumulating 20-25 cm. Light south wind gusting to strong. Freezing level 900 m.MONDAY: Cloudy with isolated flurries, snow falling late in the day. Light northwest wind transitions to strong southwest wind. Freezing level below 500m.

Avalanche Summary

A widespread storm slab avalanche cycle on Thursday was reported in the Sea to Sky region. Storm slabs failing naturally produced very large (size 3) avalanches and skier traffic triggered smaller (size 1-2) avalanches through the day. Most had a depths around 40 cm, representing the total snow accumulated starting Wednesday. There have been no avalanche reports recently for the South Coast region, but had a similar storm to the Sea to Sky region and likely had similar avalanches conditions on Thursday.Please submit any observations you have to the Mountain Information Network here.

Snowpack Summary

Heavy rain overnight has saturated the snowpack to alpine elevations and settled storm snow. At high alpine elevations above the rain, dry snow has been redistributed by strong winds forming slabs and cornices. Prior to the storm a crust extended to 1500 m elevation. At the highest elevations in the north of the region near Squamish, there could be a weak layer of feathery surface hoar roughly 50 cm below the new snow. Otherwise, the lower snowpack is well-settled.

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.