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

Natural avalanches unlikely.

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 unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

The winter permit system is not yet in effect. Click here for more information.Temperature and wind values are on the rise as another storm approaches the interior. Buried surface hoar and crusts are out there under a more significant load. Heads up!

Weather Forecast

A lull between storms this morning. Snow beginning later this morning with rising freezing levels to ~800-1000m. Moderate amounts are forecast into tonight with heavier amounts beginning early tomorrow morning and throughout tuesday as the bulk of the storm passes over the Interior. A second smaller wave is forecast for Wednesday.

Snowpack Summary

22cm of lower density snow overnight bringing recent storm snow total to around 60cm at 1900m. This sits over the Nov 21 surface hoar/sun crust layer. The Nov 9 rain crust is down ~50-80cm and the Nov 3 crust is down ~80-110.

Avalanche Summary

6 natural avalanches, size 2.0, in the highway corridor east of the Rogers Pass summit from the gullies on Mt Macdonald

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.