In 1985, DMI together with other national weather services in Nordic countries and the Netherland, Ireland and Spain to form a research collaboration around HIgh Resolution Limited Area Model (HIRLAM) for weather forecasting. The cross-country research collaboration on limited area numerical weather prediction (NWP) is the first of its kind in the world, which resulted in successful operational implementation of state of art short range regional weather forecast model in Denmark and other member services of HIRLAM. Since 2004, HIRLAM entered a research collaboration with the ALADIN consortia lead by Météo-France in joint research and development for the mesoscale, nonhydrostatic forecast system AROME. Through this code collaboration, HIRLAM consortia developed the new generation cloud-resolving NWP system Harmonie-arome, which focus on operational application of kilometer scale, ensemble forecast with focus to predict and warn high impact weather such as flash flooding, thunderstorms, heavy rain in summer and gusty wind, snow storms etc. in winter. At DMI, Harmonie-based kilometer-scale forecast system has been gradually operationalised since 2013 for use in routine forecast for Greenland, Faroe Islands and Denmark. In 2017, DMI introduced an innovative 25-member 2.5 km resolution ensemble forecast system COMEPS (COntinuous Mesoscale Ensemble Prediction System), which is based on hourly data assimilation on overlapped observation window, and an hourly refresh of probabilistic forecast with lagging. In 2018, DMI operationalised the first hectometric scale NWP system for prediction of strong coastal wind in south Greenland.