RE: La Nina
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This can be debated, but to me the most important information for impacts is not the flavor or location of the SST anomaly (unless you are living in Ecuador/Peru), but the fact it is looking more likely to be weak. Weaker events generally mean that subsequent impacts are not as confident or reliable. In other words, it's more likely that other climate phenomena and weather noise will dominate the ENSO signal b/c the forcing is weaker.