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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 but weakened during February 2009, as negative sea surface temperature (SST) anomalies remained below average across the central and east-central equatorial Pacific Ocean (Fig. T18).  The latest monthly SST index was -0.7°C in the Niņo-3.4 region, and -0.7°C in the Niņo-4 region (Table T2).

The oceanic thermocline along the equator, measured by the depth of the 20°C isotherm, remained shallower than average across the eastern half of the equatorial Pacific during February (Figs. T15, T16). Consistent with these conditions, subsurface temperatures in the eastern equatorial Pacific were 2-5oC below average at thermocline depth (Fig. T17).

Enhanced low-level easterly winds and upper-level westerly winds were present across the equatorial Pacific Ocean during February (Figs. T20, T21). These conditions continued to be associated with suppressed convection over the central equatorial Pacific Ocean and enhanced convection across Indonesia (Fig. T25). This combination of oceanic and atmospheric conditions reflects a weakening La Niņa.

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

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