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Avalanche Forecast

Archived

Dec 4th, 2019–Dec 5th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Avalanche danger is limited to the highest peaks where snow has accumulated over the past few days.

Confidence

High -

Weather Forecast

WEDNESDAY NIGHT: Partly cloudy, light wind from the northwest, treeline temperatures drop to 0 C.

THURSDAY: Clear in the morning then increasing cloud in the afternoon and light rain starting in the evening, 30 km/h wind from the southwest, treeline high temperatures around +3 C.

FRIDAY: 15-25 mm of rain as freezing level climbs to 1900 m, 50 km/h wind from the southwest, treeline high temperatures around +6 C.

SATURDAY: 20-30 mm of rain with freezing level around 1600 m, 50 km/h wind from the southwest, treeline high temperatures around +4 C.

Avalanche Summary

So far this season there has been insufficient snow on the ground to produce avalanches. Watch for high elevation areas where the recent storm delivered enough snow to cover the ground roughness.

Snowpack Summary

Recent storms delivered more rain than snow to the South Coast mountains. As a result there are just thin patches of wet snow around the peaks of the North Shore mountains (20-30 cm deep). We don't have any recent observations from higher peaks in the region, but there's potentially enough snow to produce avalanches in terrain above 1500 m.

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.