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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 2017

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - April 2017



Sea surface temperatures (SSTs) during April 2017 remained near-average over the central equatorial Pacific and above-average in the eastern equatorial Pacific (Fig. T18, Table T2). The latest monthly Niņo indices were +0.2°C for the Niņo 4 region, +0.3°C for the Niņo 3.4 region, and +0.9°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) was slightly above-average over the central and far eastern equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-2°C above average (Fig. T17).


Also during April, the lower-level and upper-level winds were near average across the equatorial Pacific (Table T1, Fig. T20, Fig. T21). Meanwhile, convection was slightly suppressed over the central equatorial Pacific and enhanced over western equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies are consistent with ENSO-neutral conditions.


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

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