Satellite Application Facility for Numerical Weather Prediction

The NWP SAF aims to improve and support the interface between satellite data/products and European activities in NWP.

The NWP SAF is one of several EUMETSAT SAFs (Satellite Application Facilities). Utilising specialist expertise from the Member States, SAFs are dedicated centres of excellence for processing satellite data and form an integral part of the distributed EUMETSAT Application Ground Segment. Further information about SAFs is available on the EUMETSAT web site.

The SAF for NWP interacts, where appropriate, with related work in other SAFs and in other EUMETSAT activities in order to enhance collaboration and to minimise duplication of effort.

Recent News and Updates

  • RTTOV v13.1 released - November 17, 2021
    RTTOV v13.1 has been released. Updates from v13.0 include: basic UV simulation capability, MFASIS simulations extended to 1.6 micron channels and MFASIS treatment of mixed phase cloud improved, new subroutines to obtain emissivities/BRDFs from the RTTOV sea surface models without running full simulations, new option to output transmittances only from the forward model (more efficient if radiances are not required), overcast and secondary radiance outputs now calculated for aerosol simulations with the fast “Chou-scaling” IR solver, and various other minor technical improvements. See the RTTOV pages for more information.
  • CWDP v1.0 released - October 14, 2021
    CWDP v1.0 has been released. This major release of the CFOSAT scatterometer wind data processor is the first version capable of processing real data from the French-Chinese CFOSAT satellite, the previous version was only tested with simulated data. On top of that, many improvements and bug fixes have been implemented in the software. See the CWDP pages ( for more information.
  • Training course: EUMETSAT/ECMWF NWP-SAF satellite data assimilation - September 15, 2021
    This 5-day course provides a complete overview of the usage of meteorological satellite observations in operational numerical weather prediction (NWP). It includes a series of lectures and practical sessions covering a range of topics – from fundamental theoretical concepts through to detailed practical implementations in modern state-of-the-art data assimilation systems. The course will take place from 7 to 11 March 2022 at ECMWF headquarters in Reading (UK). There is no course fee for this course. Registration closes: 29 October 2021 For more information, please see:
  • Data Reception Routes - September 13, 2021
    A new page, Data Reception Routes, summarises the routes via which data are received at DWD and MetOffice respectively. For some data types different reception routes are available and used at DWD and the MetOffice.
  • AAPP update 8.8 has been released. - August 24, 2021
    AAPP update 8.8 has been released. This update includes portability fixes (for gcc 8), DBNet station updates and a bug fix for HIRS processing. For details, see

For older news, see the News Archive.