Snow and Avalanche Photos
Snow and Avalanche Photos

JAN 27, 2013
Shooting cracks and reactive small, thin and soft wind slabs are in many locations. You can find these on many leeward side ridge features and in catchment zones like this couloir. These types of smaller, thin hazards are well managed by ski cutting. While traveling on the snow you can identify the slabs by a change in the snow stiffness under foot. If you are on steep enough terrain (35+ degrees) you may be able to get the slab to move. If you are unfortunate enough to get swept off your feet you could get carried or pushed over a cliff, into rocks, or just somewhere you didn’t anticipate. While currently not a major threat, if we see a spike in wind speeds or a significant dump of new snow, expect these slabs to be bigger and more threatening, and just as reactive.

Slab Avalanche on Standard West Face Run triggered by very heavy wet snow, Marmot. HS-N-R2D2-I. Did not run on the depth hoar, but on a hardness inversion within the mid-pack.

Rain runnels and dry slab avalanches on the standard west face run on Marmot. Jan 15, 2013 Photo: Anthony Larson

DEC 20, 2012 This very sensitive wind slab was up to 1 foot thick, North, 4700′ on Ray Wallace. It triggered a small pocket down slope (a few inches thick) that ran about half the distance of the run, ~400 ft. Winds were not strong enough yet to build thick mid-slope slabs.