Extreme meteorological and climatological events affect societies, economies and environments in unprecedented ways and all over the world. Operational meteorological and hydrological service providers and researchers are therefore more and more concerned in the provision and communication of weather and climate risks - considering hazard, exposure and vulnerability drivers - and associated impacts for forecast user communities, decision-makers (such as civil protection etc.) and the public. The ultimate goal of these activities are to trigger preventive actions, minimize fatalities and losses, improve resilience and boost adaptation and mitigation measures.

While this sounds convincing and simple on paper, it involves various technical, methodological, and strategic requirements and transdisciplinary challenges. In particular, user engagement, co-design and stakeholder management are important prerequisites to develop successful operational products and services. This session therefore aims to assemble relevant actors and findings from all involved parties and disciplines at the interface of weather and climate risks and impact-based services. It seamlessly unites weather and climate scales and natural and social sciences to make the best use of risk and impact information for citizens and society. We therefore invite a broad international and interdisciplinary exchange on the following aspects:

- latest research and findings on risks and impacts of weather and climate extremes to societies, economies and environments, including terminology and concepts of risk,

- risk- and impact-based forecasts and warnings to enhance the value of weather and climate services in society, including probabilistic forecasts and uncertainty,

- demonstrators or operational services for weather and climate risk assessments,

- identification of gaps, needs and transdisciplinary challenges to co-design successful services and products,

- application of novel, ideally open data sources for exposure, vulnerability and socioeconomic impacts (losses and damages) for risk and impact assessments and their validation,

- methodologies, such as software and models, for the development and provision of risk and impact assessments

We reserve the option to convert talks into poster contributions to ensure a focused and impactful session.