Skip Navigation Links 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
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 - September 2017



Sea surface temperatures (SSTs) during September 2017 remained near-average over the central equatorial Pacific and below-average across the eastern equatorial Pacific (Fig. T18, Table T2). The latest monthly Niņo indices were +0.0°C for the Niņo 4 region, -0.4°C for the Niņo 3.4 region, and -0.7°C for the Niņo 1+2 region (Table T2, Fig. T5). The depth of the oceanic thermocline (measured by the depth of the 20°C isotherm) was below-average over much of the eastern equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-3°C below average (Fig. T17).


Also during September, the lower-level trade winds were enhanced across the western equatorial Pacific and the upper-level winds were near average over much of the equatorial Pacific (Table T1, Figs. T20, T21). Meanwhile, convection was enhanced over Indonesia and suppressed over the central equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies are consistent with ENSO-neutral conditions.


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

NOAA/ National Weather Service
NOAA Center for Weather and Climate Prediction
Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
Page Author: Climate Prediction Center Internet Team
Page Last Modified: October 2017
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities