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Climate Prediction Center

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


Forecast Forum

La Niņa continued during January 2011 as sea surface temperatures (SSTs) remained well below average across the equatorial Pacific Ocean (Fig. T18). The latest monthly Niņo indices were -1.7°C for the Niņo 3.4 region and -0.7°C for the Niņo 1+2 region (Table T2, Fig. T5). (Please note that starting with this January 2011 issue, the anomalies are departures from the 1981-2010 base period means.) Consistent with these conditions, the oceanic thermocline (measured by the depth of the 20°C isotherm) remained much shallower than average across the central and eastern equatorial Pacific (Figs. T15 and T16), with sub-surface temperatures reaching 1°C to 4°C below average in these regions (Fig. T17).

Also during January, the equatorial low-level easterly trade winds remained stronger than average over the western and central Pacific (Table T1, Fig. T20), while convection remained enhanced over Indonesia and suppressed across the western and central equatorial Pacific (Figs. T25 and E3). Collectively, these oceanic and atmospheric anomalies reflect the mature phase of La Niņa.

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

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