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Climate Diagnostics Bulletin
Climate Diagnostics Bulletin - Home Climate Diagnostics Bulletin - Forecast Climate Diagnostics Bulletin - Extratropics


  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 - August 2023


During August 2023, sea surface temperatures (SSTs) remained above-average across the equatorial Pacific (Fig. T18). The latest monthly Niņo indices were +3.3C for the Niņo 1+2 region, +1.3C for the Niņo 3.4 region and +2.0C for the Niņo 3 region (Table T2). The depth of the oceanic thermocline (measured by the depth of the 20C isotherm) was above-average across the central and eastern equatorial Pacific (Figs. T15, T16). The corresponding sub-surface temperatures were 1-5C above-average in the far eastern equatorial Pacific (Fig. T17).


Also during August, the lower-level and upper-level winds were near average over much of the western and eastern equatorial Pacific, while over east-central equatorial Pacific, the lower-level wind anomalies were westerly and the upper-level wind anomalies were easterly (Table T1, Figs. T20, T21). Meanwhile, tropical convection was enhanced across the western and central equatorial Pacific, and suppressed over Indonesia (Fig. T25). Collectively, these oceanic and atmospheric anomalies were consistent with El Niņo conditions.


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

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