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Yeah, there's a reason why we focus on ENSO in this blog and why seasonal forecasts from dynamical models usually resemble the typical ENSO impacts (with the addition of the trend for temperature) - the impacts of other sea surface temperature patterns tend to be minor. However, that doesn't mean that the impacts of these other patterns are always negligible, and it doesn't mean that our models aren't missing something important. The bottom line, though, is that the atmospheric response to tropical sea surface temperature anomalies, especially from ENSO, is often the dominant seasonal forecast signal. 

In reply to by Bob G