Bernese Oberland
Hasliberg - Rosenlaui
Widespread danger. Deteriorating: low this morning, considerable by afternoon, with wet snow at the surface — turn round before it gets there.
Day Risk Profile
Avalanche Problems
No distinct problem
1
Field notes
SLF uses this label when no single problem dominates the assessment, often on lower-danger days. It doesn't mean conditions are safe: any avalanche type is still possible, and normal caution applies. On stable days this is usually a signal to enjoy the mountains with general awareness; on less-stable days where the assessment is still inconclusive, it's a signal to be cautious specifically because there's no clear pattern to follow.
Wet snow
3
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.
Snowpack & Weather
Snowpack
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 in the upper part of the Snow deposited on the ground in a multiplicity of layers.EAWS glossary can in some cases still be triggered by human activity. Such Locations delineated by aspect or altitude where avalanches can trigger and people or objects are at risk.EAWS glossary are generally located at altitudes where the snowpack is becoming moist for the first time. The likelihood of triggering is increasing during the course of each day. Especially in central Valais and in Grisons, faceted weak layers deeper in the snowpack are also still prone to triggering in isolated cases. This particularly applies to little-used slopes with thin snow cover.
The danger of natural wet snow and gliding avalanches is increasing with daytime rise of temperatures rise and solar radiation. As the day progresses, natural Avalanche of wet snow masses. Flowing more slowly than dry avalanches; usually for shorter runout distances, however with greater impact on obstacles due to higher snow density.EAWS glossary are to be expected on sunny slopes below approximately 3000 m and on north-facing slopes below approximately 2400 m.
Weather review for Friday
There were clear spells overnight and and radiative cooling was reduced. Conditions were mostly cloudy in the east during the day. There were a few snow flurries above approximately 2000 m. Conditions were quite sunny in the west and south.
Fresh snow
-
Temperature
At midday at 2000 m, around +4 °C in the north and +9 °C in the south
Wind
Northwesterly, often moderate at high altitudes and strong at times in the east
Weather forecast to Saturday
The first half of the night in particular will often be cloudy. Skies will clear in the west and south during the second half of the night, while the daytime will be mostly sunny. Broken high cloud will move in from the west in the afternoon.
Fresh snow
-
Temperature
At midday at 2000 m between +10 °C in the west and +8 °C in the east and south
Wind
Southwesterly, moderate on the northern flank of the Alps at high altitudes but elsewhere mainly light
Outlook
Sunday
Overnight to Sunday, skies will mostly be clear only in the east and overcast elsewhere. During the day, very sunny conditions will persist for longer in the east. Elsewhere, skies will be cloudy. In the afternoon, a little snow will fall in the far west and on the main Alpine ridge in Valais above approximately 2500 m. There will be an initially moderate southerly wind that will become increasingly strong at high altitudes in the afternoon.
There will be no significant change in dry avalanche danger. Wet avalanche danger will increase in the east as the day progresses. In other regions, the overcast night will mean that wet avalanches are possible from the morning onwards. With some rain, the danger may increase slightly as the day progresses.
Monday
There will be heavy cloud cover and some snow will fall, especially in the south. The snowfall level will be around 2000 m. On the main Alpine ridge from the Great St. Bernard to the Rheinwaldhorn and to the south of there, a widespread 20 to 40 cm of new snow is expected with as much as 50 to 80 cm falling in the heartland of the main Alpine ridge in Upper Valais. Precipitation may extend as far as the Aletsch region. There will be a moderate to strong southeasterly wind. Dry and wet avalanche danger will increase appreciably in the south. The danger level will probably rise to 4 on the main Alpine ridge in Upper Valais. Given heavy rain and snowfall at high altitudes, many naturally triggered avalanches, some very large, are to be expected.
North of the Main Alpine Ridge, dry avalanche danger will increase somewhat with the southerly wind and new snow at high altitudes. Wet avalanches are still to be expected, especially on north-facing slopes below approximately 2200 m.