Meteorological Forecast Model (AROME) — historical analysis data

DESCRIPTION The dataset contains historical model data from the Harmonie-Arome forecast model. Only data from the first time step, + 0 hours, have been selected for each model run. Gällandetid for the dataset is the same time as the start time of the forecast run. Harmonie-Arome is a numerical forecasting model that calculates weather trends in the future in three dimensions. Harmony-Arome is developed in an international collaboration and the version used by SMHI is based on cooperation between Nordic and Baltic countries. A numerical weather forecast is based on an analysis of the baseline position, a best description of the atmosphere in three dimenses based on observations and previous model driving. The analysis is done in order to best interpolate observations and previous modeling to a three-dimensional grid on which the model can run its physical calculations. The grid used by the model 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 close to the ground. 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 include cloudiness, temperature, amount of precipitation, ground pressure and wind speed and direction. All of this is important for the development of the weather. The AROME analysis has been carried out over an area covering Scandinavia, the northern part of the continent and the Baltic States. Due to the fact that Finland is now joining MetCoop, the area will be expanded in the east and west direction. In addition, a number of new parameters are added to meet FMIS needs. This change applies from 6 September 2017. Coordinates of the new area are given by the corners: Southwest 51.85N 0.24E Northwest 71.91N 15.32 W Southeast 51.47N 32.18E Northeast 71.16N 49.61E The grid panes are 2.5 x 2.5 km Coordinates before 6 September: Southwest 52.04N 1.64E Northwest 72.30N 12.72 W 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 commercial customers such as various newspapers and municipalities. Data from AROME can also be used as input to other models. This applies to both meteorological, hydrological and oceanographic. FORMAT Data is delivered in GRIB format. Information that facilitates use can be found at: https://www.smhi.se/data/oppna-data/grib-format-1.30761