COSMO-1 – high-resolution forecasts for the Alpine region

With a grid box size of 1.1 km, COSMO-1 is the highest-resolution weather forecast model for the Alpine region. COSMO-1 is used to make forecasts for precipitation, temperature, wind and numerous other meteorological parameters eight times a day.

COSMO-1 – the highest-resolution model for the Alpine region

The COSMO-1 model area extends horizontally over 1158 x 774 grid points with a grid box size of 1.1 kilometres (0.01°). It covers the entire Alpine region, with Switzerland at the centre of the model domain. The corner coordinates for the forecast products are as follows: NW corner 49.52° N, 0.16° E; NE corner 49.73° N, 16.75° E; SW corner 42.67° N, 1.33° E; SE corner 42.85° N, 15.94° E. COSMO covers over 80 vertical layers. The model topography reaches 4,268 metres above sea level at its highest point. M At each of the 71,703,360 grid points, the weather is predicted at 10-second intervals. 

In comparison to IFS-HRES, the European Centre for Medium-Term Weather Forecast’s (ECMWF) low-resolution global model (with a grid box size of c. 10 km), the higher-resolution of COSMO-1 enables more sophisticated weather forecasts to be produced for Switzerland, particularly for phenomena such as thunderstorms, thermal wind systems or foehn.

COSMO-1 forecast products

COSMO-1 forecasts are generated for a wide range of weather parameters. Shown below are the current COSMO-1 forecasts for precipitation, hours of sunshine and maximum wind gusts, as examples of some of the COSMO-1 forecast products.

Precipitation (litres per square metre) tomorrow

Wednesday, 08 April 2020, 07:03
Wednesday, 08 April 2020, 07:03

Sunshine duration for tomorrow

Wednesday, 08 April 2020, 07:03
Wednesday, 08 April 2020, 07:03

Maximum wind gust at 10 m above ground for tomorrow

Wednesday, 08 April 2020, 07:06
Wednesday, 08 April 2020, 07:06

Obtaining COSMO-1 forecasts in real time

MeteoSwiss uses COSMO-1 to generate forecasts for a wide range of weather parameters. These forecasts are available in real time and can be found under Services & Publications.

Where there is a need for a longer-term forecast, a deterministic forecast from COSMO-E is available as an alternative. If forecasts outside the range of the COSMO-1 model domain are required, these can be provided by the global model of the ECMWF.

Further information



Topic: Service

Mit dem numerischen Wettervorhersagemodellen COSMO-1 erstellt MeteoSchweiz Wettervorhersagen, die als Datenprodukte zur Weiterverarbeitung acht Mal...


Topic: Service

Mit COSMO-E stehen Ihnen Wahrscheinlichkeitsvorhersagen, basierend auf der Berechnung von 21 verschiedenen Vorhersagen, zur Verfügung.