Bollettino valanghe

Waadtländer Voralpen

SLF
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Pericolo valanghe

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In sintesi

In the early morning a favourable avalanche situation will prevail. Slight increase in danger of wet avalanches in the course of the day

Avalanche Activity

In the early morning a favourable avalanche situation will prevail. Slight increase in danger of wet avalanches in the course of the day

The snowpack will be wet all the way through. Dry avalanches are no longer to be expected. As a consequence of warming during the day and solar radiation wet snow slides are possible. This applies in particular on very steep north facing slopes.

Snowpack Structure

South-facing slopes are thoroughly wet far up into high alpine regions; west-facing and east-facing slopes are wet below approximately 3000 m; north-facing slopes below approximately 2400 m. As a consequence of clear nighttime skies and low temperatures, the snowpack surface is able to form a melt-freeze crust which over widespread areas is capable of bearings loads. This stabilises the snowpack. During the course of the day, the crust subsequently softens and thaws and the danger of wet-snow avalanches increases somewhat. Isolated danger zones for dry-snow avalanches are to be found on very steep north-facing slopes above approximately 2600 m more than anywhere else.

Weather Synopsis

Following a night of clear skies it was sunny in the mountains during the daytime. Fresh snow: - Temperature: At midday at 2000 m, between +5 °C in the Valais and +1 °C in the eastern regions. Wind: Winds were blowing at moderate strength, at strong velocity in some high altitude places, from northeasterly directions. Following a night of clear skies it is expected to be predominantly sunny during the daytime. In the afternoon, convective cloud build-up is possible. Fresh snow: - Temperature: At midday at 2000 m, between +4 °C in the Valais and in the southern regions and +2 °C in the eastern regions. Wind: Winds at high altitudes will be blowing at moderate strength from northerly to northeasterly directions.

Tendency

On Tuesday it will be predominantly sunny, following a night of clear skies. As a consequence of moderate northerly winds it will be cool. On Wednesday it is expected to be only partly sunny, during the afternoon showers are possible in the western regions. The avalanche situation is generally favourable during early morning hours. As a result of solar radiation and daytime warming the danger of wet-snow avalanches then increases somewhat during the course of each day. Backcountry tours and ascents to mountain refuges should be brought to an end early in the day. Isolated danger zones for dry-snow avalanches are to be found on very steep north-facing slopes above approximately 2600 m more than anywhere else.

Bulletin data: WSL Institute for Snow and Avalanche Research SLF (CC BY 4.0)

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