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Climate Diagnostics Bulletin
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  Tropical Highlights

  Table of Atmospheric Indices  (Table 1)

  Table of Oceanic Indices  (Table 2)

  Time Series

  Time-Longitude Sections

  Mean & Anomaly Fields

  Appendix 1: Outside Contributions

Tropical Highlights


The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - October 2015



Sea surface temperatures (SSTs) remained well above-average across the equatorial Pacific during October 2015 (Fig. T18, Table T2). The latest monthly Niņo indices were +2.7°C for the Niņo 3 region, +2.5°C for the Niņo 3.4 region, and +2.5°C for the Niņo 1+2 region (Table T2, Fig. T5). The depth of the oceanic thermocline (measured by the depth of the 20°C isotherm) also remained above-average across the eastern equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-6°C above average (Fig. T17).

Also during October, the low-level westerly wind anomalies and upper-level easterly wind anomalies remained strong across the equatorial Pacific (Table T1, Figs. T20, T21). Meanwhile, enhanced convection persisted across the central and eastern equatorial Pacific and suppressed convection was observed across Indonesia and western equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies reflect strong and mature El Niņo conditions.


For the latest status of the ENSO cycle see the ENSO Diagnostic Discussion at:

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