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Avalanche Forecast

Archived

Dec 23rd, 2018–Dec 24th, 2018

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

Regions

South Coast.

The weekend's storm brought substantial snowfall to the region. The snow will likely need a bit more time to bond to an underlying crust.

Confidence

High.

Weather Forecast

SUNDAY NIGHT: Mostly cloudy, freezing level 1000 m. MONDAY: Mostly cloudy with trace snowfall, 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 600 m. WEDNESDAY: Cloudy with light snowfall, accumulation 5 cm, light to moderate southwest winds, treeline temperature -2°c, freezing level 500 m.

Avalanche Summary

Reports indicate that the storm snow was reactive to skier traffic on Saturday and Sunday during the storm. Skiers were able to initiate loose dry and storm slab avalanches. Small loose dry avalanches were also capable of triggering storm slab avalanches, which ran far. The likelihood of triggering this storm snow should decrease for Monday, as a clearing trend prevails.

Snowpack Summary

Upwards of 60 cm of snow accumulated on Sunday. This snow fell on a melt-freeze crust that was formed during Thursday's storm. Reports indicate that the snow is bonding well to the crust in certain areas but that the storm snow can slide on the crust in other areas. 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.