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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

JUNE 2009

Forecast Forum

Sea surface temperature (SST) anomalies continued to increase across the equatorial Pacific Ocean during June 2009(Fig. T18).  The latest monthly SST index was +0.6°C in the Niņo-3.4 region, and +0.7°C in the Niņo-1+2 region (Table T2, Fig. T5).

The oceanic thermocline along the equator, measured by the depth of the 20°C isotherm, remained deeper than average across the equatorial Pacific Ocean during June (Figs. T15, T16). Consistent with these conditions, temperatures were 1o-3oC above average at thermocline depth across the equatorial Pacific (Fig. T17).

Also during June, the low-level equatorial easterly winds (Fig. T20, Table T1) were weaker than average across the central and eastern equatorial Pacific Ocean , and convection became increasingly suppressed over Indonesia (Figs. T25, E3). This coupling of the oceanic and atmospheric anomalies indicates the development of El Niņo.

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

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Page Last Modified: July 2009
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