Since then, numerous others have issued seasonal forecasts for worldwide basins. The predictors are related to regional oscillations in the global climate system: the Walker circulation which is related to the El Niño–Southern Oscillation; the North Atlantic oscillation (NAO); the Arctic oscillation (AO); and the Pacific North American pattern (PNA).
Since then, numerous others have issued seasonal forecasts for global ocean basins. These predictions are based on regional climate system oscillations: the Walker circulation linked to El Niño–Southern Oscillation; the North Atlantic oscillation (NAO); the Arctic oscillation (AO); and the Pacific North American pattern (PNA).