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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 2014

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights – April 2014



 During April 2014, sea surface temperatures (SSTs) were above-average across much of the eastern and central equatorial Pacific (Fig. T18, Table T2). The latest monthly Niño indices were +0.2°C for the Niño 3.4 region and -0.4°C for the Niño 1+2 region (Table T2, Fig. T5).

However, a downwelling oceanic Kelvin wave has produced a significant sub-surface warming across the central and eastern equatorial Pacific during March and April. Consistent with these conditions, 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), with corresponding sub-surface temperatures being 2-6°C above average (Fig. T17).

Also during April, the low-level easterly trade winds remained near-average across the equatorial Pacific (Table T1, Fig. T20). Meanwhile, tropical convection remained enhanced over the west-central equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies reflect a continuation of ENSO-neutral conditions.


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

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Page Last Modified: May 2014
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