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Avalanche Forecast

Archived

Mar 3rd, 2014–Mar 4th, 2014

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

Regions

Glacier.

We are at the beginning of a sequence of storms which has buried our latest weak layer.  Choose more conservative terrain these next few days and minimize your exposure to overhead hazards.

Weather Forecast

We are still under the influence of arctic air as a Pacific system collides with it further south. As the Pacific system makes it way to the interior moderate snow and warming temperatures can be expected today into tonight. We will be between systems for most of tomorrow with light snow until the evening when a more significant wave arrives.

Snowpack Summary

20cm of low density snow has buried a sun crust on south and west aspects and buried surface hoar will most likely be found in sheltered areas below tree line. In the alpine and treeline strong north and east winds from the last few days created wind slabs which also just got buried . The Jan 28/Feb 10 PWL is down 1-1.4m under a cohesive slab.

Avalanche Summary

Natural avalanches are starting to run within the highway corridor this morning with this new load. 2 east of the Rogers Pass summit, size 2.5 and 3.0 on a north aspect and one to the west on a south aspect size 1.5. All were steep gully features. Backcountry users can expect to see natural activity increase as it continues to snow.

Confidence

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.