WMO Hydrological Observing System (WHOS) broker: implementation progress and outcomes

National Hydrological Services (NHS) willing to publish their data to the benefit of a larger audience, Hydrologists, decision makers, app and portal authors willing to gain access to world-wide hydrological data, ESSI-Lab of CNR-IIA responsible for the WHOS broker component: a software framework in charge of enabling interoperability amongst the distributed heterogeneous systems belonging to data providers (e.g. data publishing services) and data consumers (e.g. web portals, libraries and apps), WMO Commission of Hydrology (CHy) providing guidance to WMO Member countries in operational hydrology, including capacity building, NHSs engagement and coordination of WHOS implementation.