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Avalanche Forecast

Archived

Feb 8th, 2015–Feb 9th, 2015

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

Regions

Olympics.

Slightly heightened avalanche danger will be limited to above treeline in the Olympics on Sunday.

Detailed Forecast

Warming is expected Monday with periods of light to moderate rain and snow with generally light winds. This should cause light rain near and below treeline to not have a significant impact on the avalanche danger. Above treeline, some shallow new snow may build small areas of storm or wind slab on isolated terrain features, such as some lee aspects near ridges, mainly NW through NE facing. 

Snowpack Discussion

Heavy rains last Thursday and Friday were followed by a small amount of heavy wet snow Saturday. The meager amounts of snow that remain in the Hurricane Ridge area are not presently creating an avalanche problem near or below treeline. In that area, much of the terrain is snow free or has patchy amounts, and even on shaded slopes there remains generally less than a couple feet of snow. 

Strong, well bonded snow at higher elevations on shaded terrain, consisting of melt-freeze grains and crusts with shallow recent new snow amounts are not posing a significant avalanche problem at this time. Recent wet, heavy snow above treeline may have been transported to some lee slopes below ridges where areas of wind slab may have developed. 

There is currently not enough snow near and below treeline at Hurricane to cause an avalanche danger. 

 

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.