The World Weather Research Programme (WWRP) and the World Climate Research Programme (WCRP) have identified collaborations and scientific priorities to accelerate advances in analysis and prediction at subseasonalto-seasonal time scales, which include i) advancing knowledge of mesoscale–planetary-scale interactions and their prediction; ii) developing high-resolution global–regional climate simulations, with advanced representation of physical processes, to improve the predictive skill of subseasonal and seasonal variability of high-impact events, such as seasonal droughts and floods, blocking, and tropical and extratropical cyclones; iii) contributing to the improvement of data assimilation methods for monitoring and predicting used in coupled ocean–atmosphere–land and Earth system models; and iv) developing and transferring diagnostic and prognostic information tailored to socioeconomic decision making. The document puts forward specific underpinning research, linkage, and requirements necessary to achieve the goals of the proposed collaboration.

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Meteorological Research Division, Environment Canada, Dorval, Quebec, Canada

National Center for Atmospheric Research, Boulder, Colorado, and Geophysical Institute, University of Bergen, Bergen, Norway

Grantham Institute for Climate Change, Imperial College London, London, and University of Reading, Reading, United Kingdom

National Center for Atmospheric Research, University Corporation for Atmospheric Research, Boulder, Colorado

Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado

Center for Ocean–Land–Atmosphere Studies, Calverton, Maryland, and Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida

Met Office, Exeter, United Kingdom

Adaptation and Impacts Research Division, Environment Canada, Waterloo, Ontario, Canada

Meteorological Research Division, Environment Canada, Toronto, Ontario, Canada

Health and Climate Foundation, Washington, D.C.

NOAA/NWS/Office of Hydrologic Development, Silver Spring, Maryland

Earth Sciences and Global Change, George Mason University, Fairfax, Maryland