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Avalanche Forecast

Archived

Nov 25th, 2014–Nov 26th, 2014

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

Regions

Glacier.

The winter permit system will be in effect on Thursday the 27th of November. Click here for information.Whoomphing and cracking, buried surface hoar and crust with big storms will keep the hazard elevated. Time for conservative decisions.

Weather Forecast

We have a break between storms today. Light flurries with temperatures hovering around -5 at 1500m. Next wave is forecast to hit the interior late tonight early tomorrow morning with moderate to heavy amounts into Thursday with moderate to strong westerly winds.

Snowpack Summary

25 cm fell overnight bringing the storm snow to ~75cm at 1900m over the Nov 21 surface hoar/sun crust layer. The Nov 9 rain crust is down ~80-100cm. Higher elevations below tree line are filled in enough to warrant avalanche concerns. Snowpack tests at 1935m produced resistant planar results on the Nov 21 and Nov 9 layers.

Avalanche Summary

Avalanches in the highway corridor east of the Rogers Pass summit reaching onto their fans up to size 3.0.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

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.