Bollettino valanghe

Waadtländer Voralpen

SLF
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Pericolo valanghe

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Avalanche Activity

The surface of the snowpack will cool hardly at all during the overcast night. Especially on steep north facing slopes wet avalanches are possible in particular between approximately 2000 and 2600 m. In the event of rain this applies in particular in the afternoon and. The near-surface layers of the snowpack can be released in isolated cases by people. This applies especially on very steep north facing slopes above approximately 2800 m. Mostly dry avalanches are small. Apart from the danger of being buried, restraint should be exercised as well in view of the danger of avalanches sweeping people along and giving rise to falls.

Snowpack Structure

In particular on north facing slopes in the high Alpine regions, in isolated cases dry avalanches can still be released in near-surface layers of the snowpack. The old snowpack is thoroughly moist up to elevated altitudes in the high Alpine regions on south facing slopes, below approximately 3000 m on west and east facing slopes, and below approximately 2600 m on north facing slopes. As a consequence of mostly overcast weather, further moisture will penetrate the snowpack only slowly.

Weather Synopsis

On Sunday evening a little snow fell locally in showers. During the night the skies cleared. Monday was sunny at first. In the afternoon convective cloud built up, followed by local showers. Fresh snow: Above approximately 2000 m: a few centimetres locally Temperature: At midday at 2000 m: about +5 °C over a wide area, but about +2 °C in the northeast Wind: Light During the night extensive high-altitude cloud will reduce the outgoing longwave radiation, and a few centimetres of snow will fall in the south. During the day it will be cloudy with bright spells. These will be mostly brief, but along the Prealps and in northern Ticino in the morning sometimes prolonged. In the afternoon a little precipitation will fall in showers in some regions. Fresh snow: With a snowfall level of approximately 2200 m, the following amounts of snow will fall:

Tendency

The weather will be mostly cloudy. Therefore the snow surface will barely be able to freeze below approximately 2600 m. On each of the coming days approximately 5 to 10 cm of snow will fall. Given the showery nature of the snowfall and scattered thunderstorms on Thursday, larger amounts are also possible locally. On Wednesday in the high Alpine regions the wind will be sometimes moderate from the southwest. On Thursday the wind in the north will be sometimes moderate from the west; in the south in the afternoon a strong northerly wind will develop. The danger of dry avalanches will increase a little in the high Alpine regions. Isolated wet snow avalanches can occur throughout the day, in particular on north facing slopes below approximately 2600 m.

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

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