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 2011

ENSO-neutral conditions continued during June 2011 as sea surface temperatures were near-average across much of the equatorial Pacific Ocean, except the far eastern equatorial Pacific (Fig. T18, Table T2). The latest monthly Ni�o indices were -0.2�C for the Ni�o 3.4 region and +0.9�C for the Ni�o 1+2 region (Table T2, Fig. T5). Consistent with these conditions, the oceanic thermocline (measured by the depth of the 20�C isotherm) remained slightly deeper than average in the eastern equatorial Pacific (Figs. T15 and T16), with sub-surface temperatures reaching 1-2�C above average in this region (Fig. T17).

However, the atmospheric circulation patterns during June continued to show some weak La Ni�a impacts.  The equatorial low-level easterly trade winds and upper-level westerly winds remained stronger than average over the central equatorial Pacific (Table T1, Figs. T20 and T21), while convection remained enhanced over eastern Indonesia and suppressed across the central equatorial Pacific (Figs. T25 and E3). Collectively, these oceanic and atmospheric anomalies reflect ENSO-neutral conditions but with weakening La Ni�a impacts in the atmosphere.

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

http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/index.html