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Eyes and ears of the avalanche warning service

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The SLF observers

Current field data are required to ensure that users can rely on the bulletins, which is why the SLF maintains its own network of observers. The official observers are trained by the SLF, report regularly on their findings and get paid for their reports. Different data may be collected depending on the situation, including for example estimates of fresh-fallen snow and fresh snowdrift, observed alarm signals and avalanches and often also an assessment of the current avalanche danger.

Some of the SLF observers file their reports mostly from a fixed location, which is generally their home or place of work. Some of these perform measurements at a measuring site as well as providing observations.

Another part of the SLF observers provide data from throughout the Swiss Alps. They submit their reports whenever they have information of interest from their respective location.

Here we present six of them from different parts of the country.



Martin Ruggli is a mountain guide and SLF observer. He explains why it's crucial for people to stay alert whenever they're outdoors in the snow.


Paulon Massy has been an observer for the SLF for an incredible 47 years. He was once buried by an avalanche while working as a ranger.


Filippo Genucchi is an SLF observer and a safety officer for the Lukmanier Pass. He trusts in the quality of the avalanche warnings.


Jon-Andri Bisaz reports observations to the SLF from the Upper Engadine region. He also benefits from the role in his work as an avalanche consultant.


Ruth Moor-Huber from Gadmen is one of only a few women working as observers for the SLF. She tells us what she likes about the role.


Nearly 200 observers throughout Switzerland send snow and avalanche reports to the SLF. This week we are introducing you to six of them.