International: TAMSAT-AgricuLtural EaRly warning sysTem (TAMSAT-ALERT) platform We propose the development of a new platform, TAMSAT-ALERT*, which will transform proven research in decision support for African agriculture into a platform co-designed with key stakeholders in the agricultural and financial sectors, dedicated to supporting farmers facing time-critical agronomic decisions every season.  TAMSAT-ALERT (AgricuLtural dEcision suppoRT) is a methodological framework for assessing weather-related risk to agriculture.  TAMSAT has piloted the framework and associated data products in several African countries, including Ghana and Zambia, in partnership with national hydrometeorological services, and leaders in the financial and agricultural sectors.    Currently the framework exists as a set of research level code, which can only be run within the TAMSAT group. The proposed project will develop TAMSAT-ALERT into a platform, which can be utilized by the agricultural and financial sectors in Africa and beyond - bridging the gap between research level products and an operational tool. To engage a wide community of stakeholders, the platform will be served through a website, a smartphone app and R/python packages.   Our vision is a set of sustainable technologies that can be exploited independently of the project investigators for societal good.   *Tropical Applications of Meteorology using SATellite data and ground observations - AgricuLtural dEcision suppoRT system The Global Challenges Research Fund (GCRF) supports cutting-edge research to address challenges faced by developing countries. The fund addresses the UN sustainable development goals. It aims to maximise the impact of research and innovation to improve lives and opportunity in the developing world.