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Pacific ENSO Update

3rd Quarter, 2012 Vol. 18 No. 3


La Niña dissipated during April 2012, as below-average SSTs weakened across most of the equatorial Pacific Ocean and above-average SSTs persisted in the east. ENSO-neutral conditions prevailed in May 2012, following the dissipation of La Niña. During June 2012, ENSO-neutral conditions continued as reflected in both the oceanic and atmospheric anomalies. However, positive equatorial Pacific sea surface temperature (SST) anomalies had grown, exceeding +0.5°C across the eastern Pacific Ocean by the end of June. This warming was consistent with a weakening of the low-level trade winds across the east-central equatorial Pacific, along with a weakening of the persistent pattern of enhanced convection near Papua New Guinea. The observations are consistent with ENSO-neutral, but reflect a likely progression towards El Niño.

Average SST Anomalies

Graphics from NOAA's U.S. Climate Prediction Center

Pacific ENSO Applications Climate (PEAC) Center
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Page Last Modified: December 12 2012 23:18:31 GMT


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