During climate-related crises, vast volumes of heterogeneous multimodal information are generated. Meaningfully processing and communicating this information for efficient decision support is a key challenge. The paper describes applying Semantic Web technologies for decision support during such crises. We are proposing the application of these technologies in the whole "sensor to decision chain". This approach is being tested within the beAWARE EU project, with contributions by domain experts. This work has received funding by the European Commission under contracts H2020-700475 beAWARE and H2020-776019 EOPEN.