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Avalanche Forecast

Archived

Dec 22nd, 2018–Dec 23rd, 2018

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

Regions

South Coast.

Snowfall amounts for Saturday night and Sunday are uncertain. Treat the hazard as HIGH if you find more than 30 cm of accumulation.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

SATURDAY NIGHT: Cloudy with snowfall, accumulation 20 to 30 cm, moderate to strong southwest winds, freezing level 800 m.SUNDAY: Cloudy with snowfall, accumulation 10 to 20 cm, moderate southwest winds, treeline temperature -1 C, freezing level 1000 m.MONDAY: Clearing over the day, light south winds, treeline temperature -2 C, freezing level 1000 m.TUESDAY: Sunny with afternoon clouds, light northwest winds, treeline temperature -3 C, freezing level 700 m.

Avalanche Summary

Although reports are limited in this region there were no signs of avalanche activity around Seymour on Friday, as described in a MIN report here. In the neighbouring Sea to Sky region, many natural and explosive-controlled avalanches have been reported through the last several days in alpine terrain. Similar avalanche activity is likely to be found at high elevations in the South Coast region.

Snowpack Summary

New snow on Saturday and Sunday are falling on a melt-freeze crust that was formed during Thursday’s storm.  The new snow may not bond well to the crust. Expect the deepest deposits in lee terrain features around treeline and alpine elevations.

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.