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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 – January 2020



During January 2020, sea surface temperatures (SSTs) were above-average across the western and central equatorial Pacific and near-average in the eastern equatorial Pacific (Fig. T18, Table T2). The latest monthly Niño indices were 0.0°C for the Niño 1+2 region, +0.5°C for the Niño 3.4 region and +1.0°C for the Niño 4 region (Table T2, Fig. T5). The depth of the oceanic thermocline (measured by the depth of the 20°C isotherm) was above-average across the central and eastern equatorial Pacific (Figs. T15, T16). The corresponding sub-surface temperatures were 1-3°C above average in the eastern equatorial Pacific (Fig. T17).


Also during January, the lower-level easterly winds were weaker than average (indicated by westerly anomalies) over the western equatorial Pacific (Table T1, Fig. T20). The upper-level westerly winds were stronger than average across the central and eastern equatorial Pacific (Table T1, Fig. T21). Meanwhile, tropical convection was enhanced around the Date Line and suppressed over Indonesia (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies were consistent with ENSO-neutral conditions.


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

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