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Climate Diagnostics Bulletin
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  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

Table of Atmospheric Indices

SEPTEMBER 2024

  SLP ANOMALIES TAHITI 850-hPa ZONAL WIND INDEX 200-hPa WIND INDEX OLR Index
MONTH   minus 5N-5S 5N-5S 5N-5S 5N-5S 5N-5S
  TAHITI DARWIN DARWIN SOI 135E-180 175W-140W 135W-120W 165W-110W 160E-160W
SEP 24 -0.5 -0.3 -0.1 0.5 0.8 0.8 0.7 0.5
AUG 24 1.7 0.0 0.9 1.0 0.7 1.1 -0.9 0.5
JUL 24 -0.6 0.7 -0.7 0.7 0.8 1.6 0.8 -0.2
JUN 24 0.8 0.8 0.0 0.6 -0.1 0.6 -0.4 0.6
MAY 24 1.0 0.1 0.5 0.5 0.9 1.4 0.3 0.7
APR 24 -0.2 0.1 -0.2 1.2 0.1 0.8 -0.4 0.3
MAR 24 0.6 0.0 0.4 1.0 0.2 0.0 0.4 0.3
FEB 24 -1.2 1.4 -1.4 0.1 -0.4 -0.9 -2.0 -1.1
JAN 24 0.4 -0.5 0.5 0.6 0.0 -0.6 -1.3 -0.0
DEC 23 0.2 0.6 -0.2 0.1 -0.9 -1.5 -1.6 -1.3
NOV 23 -0.1 1.3 -0.8 -0.5 -1.2 -1.1 -1.7 -1.2
OCT 23 1.2 2.1 -0.5 -0.6 -0.8 -1.2 -0.9 -0.6
SEP 23 -0.9 1.4 -1.3 0.1 -0.3 0.5 0.5 -0.8

TABLE 1.  Atmospheric index values for the most recent 12 months. Indices are standardized by the mean annual standard deviation, except for the Tahiti and Darwin SLP anomalies which are in units of hPa. Positive (negative) values of 200-hPa zonal wind index imply westerly (easterly) anomalies. Positive (negative) values of 850-hPa zonal wind indices imply easterly (westerly) anomalies. Anomalies are departures from the 1991-2020 base period means.


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