Alta Val Passiria · 25 April 2026

Day Risk Profile

Low

Earlier

Moderate

below 2800m

Later

Low

above 2800m

Later

Avalanche Problems

Above 2500 m

Low (1) Dry avalanches, earlier

Persistent weak layers Slab 1

N, NE, NW

above 2500m

Medium Few Fair

GM.10 GM.1

Field notes

Persistent Snowpack layer in which the crystals are poorly bonded and the layer has the potential to fail. Typical crystals in dry weak layers causing avalanches are : precipitation particles; surface hoar; faceted crystals; hollow crystals; graupel. Generally >1mm in size, loose grains with few bonds Wet weak layers can be formed by all snow crystal/grain types.EAWS glossary are very challenging to recognise. Distinctive noise (resembling a “whumpf” sound) occurring when a weak layer beneath a slab collapses. The air of the weak layer is forced outside the snowpack, with the resulting whumpf sound being heard. The sound usually indicates an unstable situation and can be accompanied by surface cracking. A whumpf is a clear avalanche alert.EAWS glossary sounds and shooting cracks are typical when present, but you can have a serious weak layer with no warning signs at the surface. Knowledge of how the Snow deposited on the ground in a multiplicity of layers.EAWS glossary has evolved is essential. SLF's travel advice is direct: travel conservatively, avoid terrain where the consequences of being caught are large, and treat the history of weather and snow as more important than what you can see today. Read the full bulletin.

Source: SLF Avalanche Bulletin Interpretation Guide

Moderate (2) Dry avalanches, later

Persistent weak layers Slab 2

N, NE, NW

above 2500m

Medium Few Fair

GM.10 GM.1

Field notes

Source: SLF Avalanche Bulletin Interpretation Guide

Below 2800 m

Moderate (2) Wet avalanches, later

Wet snow Slab 2

All aspects

below 2800m

Medium Few Poor

GM.10 GM.1

Field notes

Rolling snowballs, deep penetration when you step or ski, and small natural slides are clear signals that the Snow deposited on the ground in a multiplicity of layers.EAWS glossary is losing strength. After a clear, cold night the surface often freezes into a strong supporting Layer of hard-compacted snow resulting from a melt-freeze process or wind.EAWS glossary, and conditions are favourable in the early morning. After a warm, overcast night, the problem may be present from the start of the day. Plan early returns and watch the runout zones below you.

Source: SLF Avalanche Bulletin Interpretation Guide

Avalanche Activity

Increase in danger of wet avalanches in the course of the day.

In the late morning a favourable avalanche situation will be encountered over a wide area. As the day progresses as a consequence of warming during the day and solar radiation there will be only a slight increase in the danger of wet avalanches. Wet avalanches can in isolated cases be released by a single winter sport participant. This applies on very steep northwest, north and northeast facing slopes below approximately 2500 m, as well as on very steep west and east facing slopes below approximately 2800 m, but in isolated cases also on very steep sunny slopes at elevated altitudes. Locations delineated by aspect or altitude where avalanches can trigger and people or objects are at risk.EAWS glossary for dry avalanches are to be found on very steep shady slopes above approximately 2500 m. These places are very rare but are difficult to recognise.

Outlook

Constant avalanche danger

26 April 2026

Outgoing longwave radiation during the night will be quite good. The danger of wet avalanches will increase a little during the day.

Snowpack & Weather

Snowpack

Outgoing longwave radiation during the night will be quite good. The surface of the Snow deposited on the ground in a multiplicity of layers.EAWS glossary will freeze to form a strong Layer of hard-compacted snow resulting from a melt-freeze process or wind.EAWS glossary and will soften during the day. Sunshine and high temperatures will give rise to gradual moistening of the snowpack at intermediate and high altitudes. Shady slopes above approximately 2500 m: Faceted Snowpack layer in which the crystals are poorly bonded and the layer has the potential to fail. Typical crystals in dry weak layers causing avalanches are : precipitation particles; surface hoar; faceted crystals; hollow crystals; graupel. Generally >1mm in size, loose grains with few bonds Wet weak layers can be formed by all snow crystal/grain types.EAWS glossary exist in the bottom section of the Snow layers deposited from earlier precipitation, prior to fresh fallen snow. Old snow layers consist of metamorphosed snow crystals.EAWS glossary at elevated altitudes. On steep sunny slopes as well as below approximately 1800 m hardly any snow is lying.

Source

ALBINA

Issued

24 Apr 15:00 UTC

Valid until

25 Apr 15:00 UTC

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