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Persistent Slabs

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Be very careful when choosing terrain and make route choices with large safety margins. This type of avalanche problem is behind many avalanche accidents. It is very difficult to determine on the spot where the permanent flatbed is and how sensitive it is. The problem needs a long time to stabilize. Be especially careful when riding in new and unknown areas. Periods after snowfall, snow drifts or temperature rises are extra dangerous.


-Hard and thicker flakes on top of long-lived weaknesses deeper into the snow cover.

-The problem can rarely be detected by just looking at the snow surface.

-Lack of avalanche activity or absence of signs of instability is NOT reliable information.

The avalanches are often triggered above the skier, which makes it difficult to escape from an avalanche.

-Riders are often dragged into avalanches when they least expect it, for example on days with calm and clear weather.

-Can also be triggered remotely at long distances.

-Vary in size from large to very large and can sometimes involve several avalanche lines.

- Can spread to flatter terrain above and on the side of the steep slopes. Therefore keep a good distance to all steep terrain.

-Stabilizes slowly, the problem often lasts for several weeks, sometimes months and in some cases all winter.

-Often has rest periods when it is less sensitive, to then become active again when the weather changes, especially after snowfall, snow drifts or periods of warm weather.

-Can remain in insulated pockets long after other areas have stabilized.

- Common places to trigger avalanches in permanent flats are where the snow cover is thinner, the avalanche can then spread out on snow fields with thicker flats.