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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

APRIL 2015

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - April 2015



During April 2015, sea surface temperatures (SSTs) remained above-average across the equatorial Pacific (Fig. T18, Table T2). The latest monthly Niņo indices were +1.2°C for the Niņo 4 region, +0.8°C for the Niņo 3.4 region, and +1.4°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 above-average across the eastern and east-central equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-6°C above average (Fig. T17).

Also during April, the low-level westerly wind anomalies continued across the equatorial Pacific (Table T1, Fig. T20) and upper-level easterly wind anomalies continued over the central and eastern equatorial Pacific (Fig.T21). Meanwhile, enhanced convection was observed across the central equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies are consistent with weak El Niņo conditions.


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

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