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Bernese Oberland

Obersimmental

Mon 18 May

Manageable day. Moderate, with wet snow at the surface — the evidence is there to read before you commit to a slope.

Day Risk Profile

Moderate

Avalanche Problems

Dry avalanches · all day
Dry snow level 2 No distinct problem 2=
N, NE, E, NW
above 2200m
Dry avalanches can in some places be released in near-surface layers. The Locations delineated by aspect or altitude where avalanches can trigger and people or objects are at risk.EAWS glossary are to be found in particular on very steep north and east facing slopes. Avalanches can reach medium size. Careful route selection is recommended. The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality.
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.

Source: SLF Avalanche Bulletin Interpretation Guide

Wet-snow avalanches · all day
Wet snow level 1 Wet snow 1
All aspects · all elevations
As a consequence of warming during the day and solar radiation moist snow slides are to be expected. These are rather small. Restraint should be exercised because avalanches can sweep people along and give rise to falls.
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

Snowpack & Weather

Snowpack

The new snow and wind-drifted snow from recent days are still partly prone to triggering, especially on shaded slopes in Areas above approximately 3000 m (particularly glaciated areas).EAWS glossary terrain. At the transition to the underlying Snow layers deposited from earlier precipitation, prior to fresh fallen snow. Old snow layers consist of metamorphosed snow crystals.EAWS glossary, coarse-grained 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 still present in some places, particularly on north- and east-facing slopes at higher elevations.

Weather review for Sunday

After a clear night, it was quite sunny with some cumulus clouds

Fresh snow

-

Temperature

At midday at 2000 m, between -1 °C in the north and +4 °C in the south

Wind

Continued moderate winds from the north along the Main Alpine Ridge during the night and mostly light winds during the day

Weather forecast to Monday

The night will be partly clear in the east, and cloudy elsewhere. In the morning there will be continued bright spells, especially in the east. Elsewhere it will often be cloudy with local showers, especially on the northern flank of the Alps. The snowfall level will be around 1800 m.

Fresh snow

A few centimetres locally in the form of showers, especially in the north

Temperature

At midday at 2000 m, between +1 °C in the north and +4 °C in the south

Wind

Often light, occasionally moderate southwesterly at high altitudes in the west

Outlook to Wednesday

Monday night into Tuesday will be partly cloudy in the east and a little snow will fall above 1800 m. In the morning, there will still be residual clouds in the east. Elsewhere, it will be quite sunny at first before clouds move in from the west. In the afternoon, there will be showers in the west, falling as snow above 2200 m. Tuesday night into Wednesday will be clear in the south and often cloudy elsewhere. In central and eastern Switzerland, up to 10 cm of snow will fall above approximately 2200 m. During the day, it will be cloudy with showers in the east. In the west, conditions will be changeable, and in the south it will be quite sunny. There will be a westerly wind on both days, mostly light on Tuesday and moderate at times on Wednesday. The zero-degree level will be at 2500 m on Tuesday, rising towards 2800 m on Wednesday afternoon.

The danger of dry avalanches will decrease. Dry avalanches can still be triggered, primarily on very steep north- and east-facing slopes in the Areas above approximately 3000 m (particularly glaciated areas).EAWS glossary. The danger of wet avalanches will increase slightly as each day progresses. Backcountry ski tours should be completed early.

Source

SLF

Issued

17 May 15:00 UTC

Valid until

18 May 15:00 UTC

Next update

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