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Avalanche Forecast

Archived

Nov 23rd, 2014–Nov 24th, 2014

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

Regions

Glacier.

The winter permit system is not yet in effect. Click here for more information.Wide range of conditions out there from shallow early season low down to more of a winter snowpack with buried weak layers higher up.

Weather Forecast

A couple of storm systems are approaching the interior. The first is expected to arrive around noon today and will bring light snow into this evening with light to moderate west winds. A second storm will bring heavier precipitation with rising freezing levels Tuesday into Wednesday.

Snowpack Summary

At tree line, 40cm of recent storm snow overlies the Nov 21 surface hoar layer. This layer formed as a sun crust on steep south aspects. The Nov 9 rain crust, 5-10cm thick, is down ~50-70cm and the Nov 3 crust is down ~70-80cm.

Avalanche Summary

7 natural size 2.0 avalanches were observed yesterday in the highway corridor east of the Rogers Pass summit out of the Mt McDonald gullies.

Confidence

Due to the number of field observations

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.