La Niña and so it begins…

Raw data courtesy of NCEP/NOAA

Sea surface temperature anomalies [SST] for the last thirteen weeks in the Niño 3.4 region have been -0.5°C or lower which in the complicated world of the El Niño Southern Oscillation [ENSO] makes this the start of a new La Niña event for the autumn of 2020. As far as I can see the weekly SST anomalies in this particular section of the central Pacific have not been as low as -1.4°C since January of 2011, so recent talk of a moderate relatively short lived La Niña event may be premature and underestimated the degree (pardon the pun) of cooling that’s been going on in the Pacific recently.

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