Tropical Highlights

  Table of Atmospheric Indices  (Table 1)

  Table of Oceanic Indices  (Table 2)

  Time Series

• SOI, Tahiti/Darwin SLP & OLR  T1
  
• SOI & Equatorial SOI  T2
  
• Zonal Wind & Temperature  T3
  
• 850-hPa Zonal Wind  T4
  
• Nino region SST indices  T5
  

  Time-Longitude Sections

  Mean and Anomaly Fields

  Appendix 1: Outside Contributions

MARCH 2018

FIGURE T4.  Five-month running mean (solid line) and individual monthly mean (dots) of the standardized 850-hPa zonal wind anomaly index in the latitude belt 5N-5S for 135E-180 (top), 175W-140W (middle) and 135W-120W (bottom). Anomalies are departures from the 1981-2010 base period means and are normalized by the mean annual standard deviation.The x-axis labels are centered on January. Positive (negative) values indicate easterly (westerly) anomalies.