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Avalanche Forecast

Archived

Dec 2nd, 2019–Dec 3rd, 2019

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

Regions

South Coast.

Dangerous avalanche conditions will exist in areas with more the 30 cm of new snow.

Confidence

Moderate - Forecast precipitation (either snow or rain) amounts are uncertain.

Weather Forecast

MONDAY NIGHT: 20-30 mm of precipitation with snow above 1000-1200 m, 50 km/h wind from the west, treeline temperatures around 0 C.

TUESDAY: Light precipitation throughout morning with 5-10 mm and then increasing in intensity again in the late afternoon, rain up to 1500 m midday and then the snow line drops to 1200 m in the evening, 50 km/h wind from the west, treeline high temperatures around +2 C.

WEDNESDAY: 30-50 mm of precipitation with snow line fluctuating between 1200 and 1500 m, 70 km/h wind from the southwest in the morning the decreasing to 30 km/h in the afternoon, treeline high temperatures around +2 C.

THURSDAY: Mix of sun and cloud with some light flurries, 20-30 km/h wind from the south, treeline high temperatures 0 C.

Avalanche Summary

So far this season there has been insufficient snow on the ground to produce avalanches. This will change on Tuesday and Wednesday with the incoming storms. Watch for areas where there is enough snow to cover the ground roughness.

Snowpack Summary

A stormy week will bring much needed snow to the South Coast region. 20-30 cm of new snow is possible on Monday night, which will transition to light rain on Tuesday, and then another heavy dose of snow on Tuesday night. This new snow will form the majority of the snowpack. Prior to this storm the North Shore mountains had about 25 cm of snow on the ground and some higher alpine areas had slightly deeper deposits of crusty snow.

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.