The snow depth map is published at around 7 am CET from 1 November until 30 June.
The map is based on calculations from the operational snow hydrological service of the SLF (OSHD), using input data from the operational weather forecast models of MeteoSwiss and the assimilation of snow measurement data from automatic weather stations and observers. The calculations take into account various processes such as the settlement of the snowpack by its own weight, melting in the event of significant warming or when rain falls into the snowpack. Also taken into account is when the snow falls on snow-free and still warm ground and therefore melts again.
The data are modelled for the whole of Switzerland with a resolution of approx. 250x250 m and smoothed for the presentation.
A time chart for values of the individual measurement stations can be accessed from the measured data map.