Anyone can freely access GloFAS forecast and data by simply registering and creating a user account here:
https://global-flood.emergency.copernicus.eu/accounts/login/?next=/glofas-forecasting/
More info about GloFAS can be found on the GloFAS webpage (https://global-flood.emergency.copernicus.eu/) or in the GloFAS User Guide (https://protect.checkpoint.com/v2/r02/___https://confluence.ecmwf.int/display/CEMS/GloFAS&%2343;User&%2343;Guide___.YzJlOmlzcmFlbG1pbmlzdHJ5b2Z0cmFuc3BvcnQ6YzpvOmFjNmEzMjE5ZjJmYjQzMzc3ZjdhYzRkNmViYzc2ZmQ0Ojc6MmM0Mzo3ZDE0OTQ0NGIxMDcwZDllZDQ0NDgxYjFkNmMzYmRiYWUwNGNlZjAxNjdmODdkM2NjYWFhMTY2OTY2NGU2MTUzOnQ6VDpG)