Meteorological forecasting model (AROME) - historical analysis data

DESCRIPTION The data set contains historical model data from the Harmonie-Arome forecast model. Only data from the first time step, +0 hours, has been selected for each model run. The applicable time for the dataset is the same time as the start time of the forecast run. Harmonie-Arome is a numerical forecasting model that calculates the future development of the weather in three dimensions. Harmonie-Arome is developed in an international collaboration and the version used by SMHI is based on a collaboration between Nordic and Baltic countries. A numerical weather forecast is based on an analysis of the initial situation, a best description of the atmosphere in three dimensions based on observations and previous model driving. The analysis is done to best interpolate observations and previous modeling to a three-dimensional grid on which the model can run its physical calculations. The grid that the model uses today has 2.5 x 2.5 km horizontal resolution and vertically there are 65 model levels of the same horizontal grid with the lowest level near the ground surface. On this grid, physical parameters are calculated, of which some forecast time steps are printed as meteorological forecasts or analyses on data files. The meterolological model runs in its current configuration every hour with slightly different settings and forecast lengths up to just under three days printed on file. In this flow, a smaller selection of parameters, mainly at or just above ground level, is available with new data every 6 hours. Examples of parameters are cloudiness, temperature, precipitation, ground pressure and wind speed and direction. All of this has a bearing on the development of the weather. The AROME analysis has been made over an area covering Scandinavia, the northern part of the continent and the Baltic States. As Finland joins MetCoop, the area will be expanded eastwards and westwards. In addition, a number of new parameters are added to meet FMI's needs. This change is effective as of 6 September 2017. Coordinates for the new area are given by the corners: Southwest 51.85N 0.24E Northwest 71.91N 15.32W Southeast 51.47N 32.18E Northeast 71.16N 49.61E The grid squares are 2.5 x 2.5 km Coordinates before 6 September: Southwest 52.04N 1.64E Northwest 72.30N 12.72W Southeast 52.04N 28.36E Northeast 72.30N 42.72E USE At SMHI, AROME is used as a basis for forecasts in radio and television. It is also used for forecasting to commercial customers such as various newspapers and municipalities. Data from AROME can also be used as input to other models. This applies to meteorological as well as hydrological and oceanographic. FORMAT Data is delivered in GRIB format. Information to facilitate its use can be found at: https://www.smhi.se/data/oppna-data/grib-format-1.30761