Seasonal-to-interannual prediction of U.S. coastal marine ecosystems: Forecast methods, mechanisms of predictability, and priority developments

•Marine ecosystem forecasts can aid ocean resource and coastal community management.•A range of statistical and dynamical forecast methods can be leveraged.•Physical and biological mechanisms of predictability are detailed.•Understanding these mechanisms can improve forecasts and inspire confidence in them.•Priorities are model development, skill assessment, infrastructure, and communication.