Wind Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
Temperatures have once again dipped into the subzero range, and the strong easterly winds that arrived on Friday have calmed down. Today's main avalanche concerns lie at the interface of the few inches of new snow we received Friday night and the older, weak surfaces that snow buried. With only 2 to 4" new snow on the ground, the only places this will be able to produce an avalanche big enough to carry or bury a person will be in wind-loaded terrain. You will most likely find this problem above treeline, on steep slopes just below ridgelines, convex rolls, or steep gullies.
You can use small wind-loaded terrain features to test this layer and see how reactive it remains today, but the better option may be to just avoid steep, wind-loaded slopes. Warning signs like shooting cracks or collapsing are clear indicators of unstable snow, but these do not always show up — even when conditions are unstable.
Dry Loose Avalanches: This low-density snow has fallen on firm surfaces for the most part, and is likely to produce fast-moving dry loose avalanches (sluffs) in steep terrain. With only a few inches of fresh snow, these are unlikely to be big enough to bury a person, but they may get big enough to carry someone, and will be important to pay attention to today.
(12/27/2025)
Small natural dry loose avalanche on Sunburst. It will be easy to trigger small avalanches like these in steep terrain today.
Photo: Marc Heifetz