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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

APRIL 2023

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - April 2023



During April 2023, sea surface temperatures (SSTs) were above-average in the western and the far eastern equatorial Pacific (Fig. T18). The latest monthly Niņo indices were +2.5C for the Niņo 1+2 region, +0.2C for the Niņo 3.4 region and +0.4C 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 equatorial Pacific (Figs. T15, T16). The corresponding sub-surface temperatures were 1-7C above-average in the far eastern equatorial Pacific (Fig. T17).


Also during April, the lower-level and upper-level winds were near average across most of the equatorial Pacific (Figs. T20, T21). Meanwhile, tropical convection was suppressed over the central equatorial Pacific (Fig. T25). 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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