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Avalanche Forecast

Archived

Dec 5th, 2019–Dec 6th, 2019

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

Triggering storm slab avalanches is possible in the alpine. Back off to more conservative terrain if you notice heavy loading from new snow or wind.

Confidence

Moderate - Uncertainty is due to the track & intensity of the incoming weather system.

Weather Forecast

THURSDAY NIGHT: 15 cm of snow in northern parts of the region and 5 cm of snow above 1700 m in southern parts of the region, 40-60 km/h wind from the southwest, alpine temperatures around -2 C.

FRIDAY: Scattered flurries with up to 5 cm of snow, 40-60 km/h wind from the southwest, alpine temperatures near 0 C.

SATURDAY: 10-15 cm of new snow above 1400 m (rain below), 30-50 km/h wind from the northwest, alpine high temperatures around -2 C.

SUNDAY: Mix of sun and cloud, light wind from the north, alpine high temperatures around -4 C.

Avalanche Summary

Minimal avalanche activity has been reported over the past week. Some parts of the region may have received enough new snow over the past few days to form slabs at higher elevations. The greatest concern is in wind affected terrain and where the storm snow sits on smooth surfaces (such as glaciers, rock slabs, and areas that already have enough snow to cover rocks and shrubs).

Snowpack Summary

Less snow has made its way into the South Coast Inland region than areas closer to the coast. 10-15 cm of new snow is expected by Friday afternoon, bringing recent storm totals to about 25 cm for most parts of the region. The exception is higher elevation terrain around the Coquihalla that will have closer to 40 cm of storm snow by the afternoon.

Even with this new snow, snowpack depths remain quite thin throughout the region. Current snowpack depths are around 50 cm at upper treeline elevations, with many rocks and trees sticking out at lower elevations. In the alpine you can find slightly deeper areas where wind has formed hard wind slabs.

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.