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Avalanche Forecast

Archived

Nov 21st, 2016–Nov 22nd, 2016

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

Glacier.

Large Areas of Glacier National Park Are CLOSED For Avalanche Control Using EXPLOSIVES. For access information visit the Rogers Pass Discovery CentreToday is the first of the Winter Permit System (click here for more information)

Weather Forecast

2 mm of precip is expected throughout today as a weak low pressure system tracks inland and winds are forecast to 30 kph at ridgetop from the South.  Warmer air associated with the incoming weather system will raise freezing levels to 1700m this afternoon. Light snow will continue through next week.

Snowpack Summary

Increasing winds and regular daily snowfall have built a storm slab in the alpine and windslab at ridgetop. The November 13 crust is buried 40-70cm and this interface is an important layer to watch as its starting to produce sudden shears in tests. Below 1900m snow depths are less than 60cm with many early season hazards.

Avalanche Summary

3 size 2.0 natural avalanches were observed from steep terrain on Mt MacDonald in the highway corridor over the last few days. A public MIN report from Saturday described a cornice triggered sz 2 running 800m from a SW asp on Video pk. Heavy sluffing was also observed on steep north facing terrain.

Confidence

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

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.