Avalanche: Rolfson

Observer Name
Craig Gordon/ Trent Meisenheimer
Observation Date
Tuesday, January 1, 2013
Avalanche Date
Tuesday, January 1, 2013
Region
Skyline » Huntington Canyon » Left Fork Huntington Canyon » Rolfson
Location Name or Route
Rolfson Canyon
Elevation
9,900'
Aspect
Northeast
Slope Angle
39°
Trigger
Unknown
Avalanche Type
Hard Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
3'
Width
175'
Comments

What a storm for the Skyline, the newest onslaught of snow has settled nicely into 2-3 feet of supportable powder riding. Its epic to say the least. Riding and traveling conditions are stellar. This was a much needed storm for the Skyline, and has greatly improved the snow pack across the region.

Winds remained calm during and after the storm with almost all aspects having soft settled powder, some exposed peaks and wind features being the exception. A ridge of high pressure is forecasted for the region for the next few days bringing smog to the valleys and sunny skies in the mountains, riding conditions should remain excellent.

To our surprise the Skyline did not go through a natural avalanche cycle with its new heavy load. However, this means there are a lot of slopes still hanging in balance, just waiting for the unaware rider to come along and trigger an avalanche.

Comments

This is the same avalanche that Steve and Darce observed on December 26. Better light today. Impressive avalanche.

Comments

In early November the Skyline had a cold dry period lasting a few days, this produced a weak layer that is now buried 3-4 feet deep on all northerly facing aspects.This weak layer (called faceted snow) is weak and unsupportable, especially when you put a heavy load of snow on top. All upper elevation northerly facing slopes should remain suspect for the time being

The main concern would be triggering one of these slab avalanches. These avalanches will be a few hundred feet wide and 3-5 feet deep. (Unmanageable) There is only one way to avoid this danger and that is by terrain choice.

For the safest riding, stick to gentle slopes generally less than 34 degrees facing the southern half (Sunny Side) of the compass with nothing steeper above or adjacent to you. (Hint) if you own a smart phone, download an inclinometer app or compass (free) this way you can measure slopes angels and know what direction the slope or aspect is facing. Boondocking in the Meadows is also another great powder option.

Bottom line: Best to avoid the steep (34 degrees or steeper) shady slopes for now. Tracks on the slope are a poor indicator of stability. South facing slopes with cold powder remain the safest climbing options.

Comments

Slab avalanche in Rolfson Canyon, it was on a steep (39 degree) NE facing slope, exactly the terrain you would expect to find an avalanche.

Coordinates