Wind Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
New snow and very strong NW winds will build dense slabs of wind drifted snow across middle and upper elevations. The heaviest precipitation will fall during the overnight hours, so expect the most sensitive, dangerous conditions during the morning. Look for these slabs to form on the downwind sides of ridges, below cornices, and near the top of gullies. However, strong wind speeds often create irregular loading patterns, so you may find these slabs further down slope or even on mid-slope convexities.
There should be plenty of clues, such as blowing snow or wind-textured surfaces, to help you identify where slabs have formed. Pay attention to stiffer snow surfaces and shooting cracks are obvious clues that slabs are resting uneasily. These slabs may range from soft to hard, and could break above you in heavily loaded alpine terrain. You can significantly reduce your exposure to this problem by sticking to wind-sheltered terrain, less than 35 degrees.
In some isolated, steep sheltered terrain, triggering small storm slabs or fast running dry loose may be possible.
(12/26/2025)
Wind drifted pockets showed signs of reactivity on Friday. These observations should help you avoid wind-loaded start zones.
Photo: Joe Dellaporta