In recent years, we have seen increasing demands for subseasonal-to-seasonal (S2S) forecasts and products in hydrologic, transportation, agriculture, fisheries and other sectors that require specific information at different times to meet decision makers’ needs. As our S2S forecast systems are developing, we need to ensure that we are appropriately targeting the water resources, agriculture, fisheries, energy and defense needs of users. National Research Council studies and a recent survey by the Federal agencies have attempted to highlight needs for S2S prediction, yet a clear path to success remains elusive. A joint Federal effort to address S2S prediction has been proposed if a tractable path can be described.

This first session in a three part S2S-focused series highlights stakeholder needs and priorities for subseasonal (weeks) to seasonal (up to two years) forecast products and information. Parts 2 and 3 will focus on S2S Prediction/predictability and S2S Forecast system developments. For this session, we invite presentations addressing the pressing needs for S2S forecast information, current products in use, including forecast calibration and multi-model combination, metrics for evaluating products, and challenges around information dissemination and communication.

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