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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


The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - February 2015



During February 2015, sea surface temperatures (SSTs) remained above-average across the western and central equatorial Pacific (Fig. T18, Table T2). The latest monthly Nino indices were +1.0C for the Nino 4 region, +0.6C for the Nino 3.4 region, and -0.6C for the Nino 1+2 region (Table T2, Fig. T5). The depth of the oceanic thermocline (measured by the depth of the 20C isotherm) was above-average across the central and east-central equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-4C above average (Fig. T17).

Also during February, the low-level easterly trade winds remained weaker than average across much of the equatorial Pacific (Table T1, Fig. T20) and upper-level easterly wind anomalies were observed over the east-central equatorial Pacific (Fig.T21). Meanwhile, convection remained enhanced over the western equatorial Pacific, and suppressed across the east-central equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies are consistent with borderline, weak El Nino conditions.


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

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