Previsão Master is a Brazilian weather forecasting project offering high-resolution forecasts for more than 5,500 cities across the country. Its forecasts use the WRF model at 3-kilometre resolution, designed to represent local features such as mountains, valleys and localized storms in greater detail than the global models cited by the site. Users can explore hourly conditions and information about rain, wind, hail and thunderstorms, alongside convective indicators including CAPE, wind shear, helicity, MESH and lightning density.

The service also provides a live weather map, radar views, nowcasting, tornado information and historical forecast data. Previsão Master says it processes raw data from 47 radars, producing products such as SuperResolution, three-dimensional scans, VIL, MESH and echo tops. Meteorological data from public institutions remains freely available on the site, including an archive of previous days. A paid subscription supports access to selected radar products processed by the project, while visitors can also contribute to help keep the service running and support ongoing improvements.