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Avalanche Forecast

Archived

Feb 7th, 2015–Feb 8th, 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.

Heightened avalanche danger will be limited to above treeline in the Olympics on Saturday.

Detailed Forecast

A break between systems is expected during the day Sunday. This should give time for any recent shallow storm slab or wet new snow to settle and possibly refreeze to form new surface crust layers. This should allow for a decreasing danger at higher elevations where more recent snow may have accumulated. Watch for wind transported new snow on some higher elevation lee slopes, mainly N-E facing.

At mid and lower elevations, little to no snowcover will not generally pose an avalanche threat.

Snowpack Discussion

The small amount of new snow received this week at Hurricane Ridge has been washed away by heavy rains Thursday and Friday.

Temperatures have cooled slightly Saturday, enough to deposit an inch or two of heavy wet snow at the Hurricane Ridge elevations, near 5000 feet.  

The last observations from Hurricane Ridge in late January found snowdepths averaging 40-80 cm on the N slopes with a few drifts above 1 meter above treeline areas accessible from Hurricane Ridge. Near and below treeline, snow cover remains patchy. 

Strong, well bonded snow at higher elevations on shaded terrain, consisting of melt forms and crusts with shallow recent new snow amounts are not posing a significant avalanche problem at this time.

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.