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Avalanche Forecast

Archived

Nov 25th, 2018–Nov 26th, 2018

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

Sea To Sky.

Dial back your terrain selection during the storm. Storm slabs will form rapidly where precipitation falls as snow rather than rain.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

Sunday night: Wet flurries bringing 10-15 cm of new snow mainly to alpine elevations. Moderate to strong south winds.Monday: Mainly heavy rain with possible accumulations of up to 40 cm of new snow above 1800 metres. Strong to extreme south winds. Alpine high temperatures around 0 with freezing levels to 2200 metres or higher.Tuesday: Heavy rain transitioning to snowfall over the day with possible accumulations of up to 25 cm of new snow, primarily in the alpine. Moderate southwest winds. Alpine high temperatures of 0 to -1 with freezing levels declining from around 2100 to 1800 metres over the day.Wednesday: Cloudy with flurries bringing about 10 cm of new snow. Light southwest winds. Alpine high temperatures around -3 with freezing levels around 1400 metres.

Avalanche Summary

Small natural and skier-triggered storm slab avalanches were observed out of steep, wind-loaded terrain at alpine elevations in the Whistler area on Friday and Saturday. The incoming storm is expected to build another round fresh storm slabs above the rain line on Monday.Please submit any observations you have to the Mountain Information Network here,

Snowpack Summary

The deepest snow is found at alpine elevations, with depths of around 60-100 cm. Approximately 30 cm of newer snow now lies above older wind slabs that formed with strong southerly winds on Wednesday. Below this lies a thin crust, now buried around 50 cm. A thicker lower crust, that may be associated with weak faceted crystals in some places lies close to the ground. This is most likely to cause problems in glaciated terrain or on smoother, high elevation slopes where the summer snow did not melt out.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.