Due to the ever-increasing number of sensors, Web services, and Web feeds, an outstanding range of information and data sources exists. However, at present time, it is rather inconvenient for a user to receive information, which matches not only thematic, but also userdefined temporal and even spatial criteria. As an example, a person might be interested if the weather conditions in the northern part of Lake Garda are suitable for wind surfing in the afternoon, and thus wants to be informed as soon as chosen criteria are met. Therefore, it is the aim of this paper to present a conceptual framework of a Geodata-based Alerting Service (GAS), which matches data retrieved from a Web service against user defined parameters, and – in case these criteria are met – creates an event and sends off a notification. The challenge in this context is to develop a concept as lean as possible, exclusively using existing and common Web technologies, while at the same time handling various data formats and Web services. To foster the acceptance and broad application of the framework, different user requirements, both from the perspective of a service receiver and as a service provider need to be identified and accounted for. Among other things, this requires the development of a graphical user interface, the exclusive usage of open source software, as well as a lean, performant and well documented framework architecture. As a result, a conceptual framework is provided, consisting of different components and exemplary data interfaces. For a broad distribution of the framework, and to foster further development, the framework will be provided for general use via Web-based repositories, once implemented.