A selection of meteorologically significant products from the HARMONIE atmospheric model. This data is updated hourly. NWP computer models use high performance computers to solve a set of hydro-dynamical equations that mathematically describe motions in the atmosphere. NWP simulations are used along with the skill of experienced forecasters to predict future weather events. There are many inputs to our prediction model such as, previous model run, current weather observations, marine buoy data and satellite imagery to name a few. The two main components of any atmospheric model are known as the dynamics and the physics. For the dynamics, we divide the forecast region into a grid and use mathematical algorithms to solve the equations governing the motions of the atmosphere at each grid-point. Currently, this model grid has a 2km horizontal resolution. The physics of the model considers the key processes which occur at scales smaller than this, and thus are not “seen” by the grid. These include solar radiation and turbulence. The data presented here are from the control and each ensemble member of the NWP system. The mbr000 folder represents the control model run while mbr011 for example would be the 11th ensemble run. Included in the directory structure are json metadata files with a filename similar to its corresponding grib2 file with a .json extension. This data is released in response to the EU's open data directive under a CC-by-4.0 licence. For official weather forecasts please see met.ie