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Avalanche Forecast

Archived

Nov 24th, 2014–Nov 25th, 2014

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

Regions

Sea To Sky.

We have limited observations from the field. Send us yours at [email protected]!

Confidence

Fair - Due to the number of field observations

Weather Forecast

Variable stormy weather is expected to continue for the forecast period.Tuesday: 10-20cm of snow, freezing level around 1400m, and light ro moderate southerly wind. Wednesday: 20-30 mm of precipitation with freezing levels as high as 2400 m, and extreme southwesterly winds. Thursday: Continued heavy precipitation with freezing levels around 2000 m and moderate but gusty southerly alpine winds.

Avalanche Summary

Recent reports from the Whistler area include a small 25 cm thick skier-triggered storm slab avalanche on a northeast facing alpine slope running on recently buried facets.

Snowpack Summary

As we begin our forecasting season, we are working with limited information from the field. Early reports suggest there's enough snow for avalanches at alpine and some treeline elevations. Recent snow is likely to have been redistributed into slabs on lee slopes at alpine elevations. This snow may overlie a weak old snow surface (surface hoar, facets and/or a crust) which developed during the recent dry spell. Check the bond of the snowpack at this level and take a cautious approach as new snow builds deeper above this layer.

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.