“Norkyst” version 3: the coastal ocean  forecasting system for Norway

Christensen, Kai Håkon; Albretsen, Jon; Asplin, Lars; Frøysa, Håvard Guldbrandsen; Gusdal, Yvonne; Iversen, Silje Christine; Jensen, Mari Fjalstad; Johnsen, Ingrid Askeland; Kristensen, Nils Melsom; Sævik, Pål Næverlid; Sandvik, Anne Dagrun; Simonsen, Magne; Skarðhamar, Jofrid; Sperrevik, Ann Kristin; Trodahl, Marta

doi:10.5194/gmd-19-2785-2026

Articles | Volume 19, issue 7

https://doi.org/10.5194/gmd-19-2785-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-19-2785-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 7

Model description paper

|

13 Apr 2026

Model description paper |

| 13 Apr 2026

“Norkyst” version 3: the coastal ocean forecasting system for Norway

Kai Håkon Christensen, Jon Albretsen, Lars Asplin, Håvard Guldbrandsen Frøysa, Yvonne Gusdal, Silje Christine Iversen, Mari Fjalstad Jensen, Ingrid Askeland Johnsen, Nils Melsom Kristensen, Pål Næverlid Sævik, Anne Dagrun Sandvik, Magne Simonsen, Jofrid Skarðhamar, Ann Kristin Sperrevik, and Marta Trodahl

Data sets

Norkyst_v3-800m - ROMS, Norkyst_v3-800m 120 hours ocean forecast, from 2024-01-01T00:00:00, ongoing Division for Ocean and Ice https://data.met.no/dataset/1250dfdf-975c-4c5e-85d4-745506402f06

Catalog Jon Albretsen et al. https://thredds.met.no/thredds/catalhttps://thredds.met.no/thredds/catalog/romshindcast/norkyst_v3/catalog.html

ROMS Norkyst v3 coastal ocean forecasting system Kai Håkon Christensen et al. https://thredds.met.no/thredds/fou-hi/norkystv3.html

Norkyst v.3, 120 hours ocean forecasts Division for Ocean and Ice https://data.met.no/dataset/1250dfdf-975c-4c5e-85d4-745506402f06

Model code and software

Norkyst v.3 input files (3.0) Kai Håkon et al. https://doi.org/10.5281/zenodo.16810677

Copy of Release ROMS/TOMS 3.9 Rutgers, The State University of New Jersey https://doi.org/10.5281/zenodo.17046086

Geoscience Community Analysis Toolkit Technologies, Visualization & Analysis Systems https://doi.org/10.5281/zenodo.15991044

Interactive computing environment

Analysis and plotting scripts Kai Håkon Christensen et al. https://doi.org/10.5281/zenodo.17053760

Short summary

This paper describes Norkyst, the operational coastal ocean forecasting system for mainland Norway, which is now in version 3. The system produces five day forecasts of ocean currents, temperature, salinity, and sea surface height every day, and we also maintain an archive of historical data going back to 2012. We show that the outputs of Norkyst have sufficient quality so that it's intended use as a free public service supporting scientists, ocean managers, and industry is justified.