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PartnerNews | The SLF Avalanche Bulletin turns 75

Happy Brithday!

by PowderGuide 12/05/2020
The Swiss Avalanche Bulletin is entering its 75th season! Congratulations and thank you for the great service! To mark the anniversary, PowderGuide.com (as well as the SLF homepage) will be publishing various articles about the work of the SLF over the next few weeks.

First, let's take a look at the avalanche bulletin as such:

It is not produced automatically at the touch of a button, but on the basis of expert knowledge and experience. There are a total of eight forecasters at the SLF, three of whom are always on duty together. They are assigned as "beginner", "main responsible person" and "reserve person". In the next rotation, the "starter" becomes the "main person in charge", the "main person in charge" becomes the "reserve person" and the "reserve person" leaves the bulletin service. This rotation procedure ensures that knowledge about the previous development of the snow and avalanche situation is passed on in an overlapping manner and is not lost.

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Daily routine

Avalanche risk assessment is an ongoing process. The forecast for the following day begins before midday with a detailed data analysis. The avalanche forecasters evaluate all available information using various specially developed programs. The focus is on the avalanche-forming factors and their development over the coming days. A briefing takes place at 3 pm. The main service presents its analysis and then the assessments of the various avalanche warning systems are compared and discussed. At the end of the briefing, there is clarity about the snowpack structure, the most likely course of the weather and, based on this, the expected avalanche situation including the danger level, particularly affected parts of the terrain, avalanche problems, etc. At 5.30 a.m. the next day, the main service starts the new analysis. The focus here is on unexpected developments during the night, information from observers that does not fit the picture and changing weather forecasts that could make it necessary to adjust the assessment.

Set catalog for automatic translation

The avalanche warning systems create a separate hazard description for each hazard area. Particularly in the morning, the time window between the arrival of the observations from the terrain and the output time is so short that manual translation is not possible. For this reason, a fully automatic translation system was developed at the SLF. It is based on a catalog of predefined sentences that have been translated into all the required languages and stored in the database. When the bulletin is created, the hazard descriptions are not written freely, but are compiled from these predefined sentences so that they are immediately available in all languages. The individual sentences are not fixed so that all possible situations can be described. They consist of different segments, each of which can be selected from predefined options. Paper on the sentence catalog: Download as pdf.

You can find more information on the daily creation of the SLF Bulletin here and below under "further articles".

This article has been automatically translated by DeepL with subsequent editing. If you notice any spelling or grammatical errors or if the translation has lost its meaning, please write an e-mail to the editors.

Show original (German)

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