Bulletin d’avalanche

Pre Alps

LWD Vorarlberg
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Danger d’avalanche

Above treeline
3 · Marqué
Below treeline
2 · Modéré
Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Fresh snowdrifts are prone to triggering

Problèmes avalancheux

  • Wind slab

    • Toutes altitudes
  • New snow

    • Toutes altitudes

Snowpack Structure

Amid further snowfall and strong W/NW winds, trigger-sensitive snowdrift accumulations are still being generated. Exposed crests and ridges are often windblown and bare of snow. Esp. at intermediate altitudes there is often surface hoar. On south-facing slopes at high altitudes, often a melt-freeze crust and on north-facing slopes in leeward terrain, often soft layers or surface hoar. Bonding of the fresh snow to the old snowpack is often poor.

Weather Synopsis

Friday: conditions will be pleasant. High-altitude clouds will make some sunshine possible in the morning. In the afternoon, clouds will thicken, the light become diffuse. It will remain partly cloudy in the Bregenzerwald mountains and Prealps. In ridgeline zones and pass areas, stormy-strength winds. At 2000 m: -7 to -3 degrees. Strong to stormy NW winds.

Tendency

On Friday night, rainfall/snowfall will set in. The fresh snow will be transported far-reachingly at high altitudes. The snowpack remains prone to triggering, avalanche danger levels may rise further.

Avalanche Activity

Fresh snowdrifts are prone to triggering

Fresh snow and freshly generated snowdrift accumulations are prone to triggering. Exposed ridges and crests are often windblown and bare of snow. Esp. intermediate altitudes evidence surface hoar. One person can trigger small-to-medium avalanches in gullies and bowls and behind abrupt discontinuities in the terrain. In extremely steep and rocky terrain, small to medium sized loose-snow avalanches are possible.

Bulletin data: Avalanche Warning Service Vorarlberg (CC BY 4.0)

Régions couvertes