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Avalanche Forecast

Archived

Feb 2nd, 2015–Feb 3rd, 2015

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

Regions

Glacier.

Adjust your backcountry objectives to be more conservative as a new weak layer is buried deeper.

Weather Forecast

Continued snowfall is expected for the central Interior into mid-day Tuesday with amounts ranging between 10-20cm. Freezing levels are to remain steady at ~1000m. Moderate to strong higher elevation winds will peak tonight from the southwest and taper off through tomorrow. A weak ridge of high pressure will break this system up on Wednesday.

Snowpack Summary

The Jan 30 surface hoar/crust layer is down 30-35cm below recent storm snow. The crust reaches to 2200m above which it becomes firm wind pressed snow. The Jan 15 surface hoar layer is down 60-100cm. The Dec 17 surface hoar/ crust complex is down 140-190cm.

Avalanche Summary

No new avalanches observed yesterday.

Confidence

Intensity of incoming weather systems is uncertain

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.

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.