As the landscape of weather warnings and climate services grows increasingly intricate, both in technical and organisational dimensions, the concept of the value chain emerges as a crucial tool for evaluating the utility and net benefits of these services, both for society at large and for specific actors, including service providers and users. Within the framework of WMO’s "Early Warnings for All" initiative, this session aims to contribute to a deeper understanding of monitoring and evaluation to enhance the effectiveness of early warning systems, including:

• Understanding the Warning Value Chain: Exploring the intricacies of value chains in weather services, emphasising relationships, processes, inputs, outcomes, and operational contexts of each stakeholder within the warning chain.

• Methods for Analysis: Discussing diverse analytical methods for value chain assessment, revealing different characteristics and contributing to a comprehensive understanding of service design, and proposing options for improvement, considering the sequence of scientific disciplines involved.

• Case Studies: Highlighting the effectiveness of value chain approaches through case studies on high-impact weather events by examining the tools, processes, partnerships, and infrastructure embedded in existing warning chains. Showcasing successes and failures, providing evidence to identify shortfalls and propose investments in new capabilities and partnerships. Both ex-ante studies (for new services) and ex-post studies (for services already in use for at least some time) are welcome.

We invite submissions of abstracts until 21 December 2023 that align with the above themes, as well as challenges, gaps, and opportunities arising from the application of value chains in the evaluation of early warning systems.