Should forecasting El Nino’s onset be distinguished from forecasting its post-onset locked-in phase? If an El Nino occurs in December 2014, is it the same one forecast earlier in 2014? Should the forecast of El Nino’s onset be considered experimental? Should the post-onset forecasts be considered operational? To what extent do the various oscillations impact the forecasting of El Nino’s onset and teleconnections?

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