pattern of tropical sea surface temperature (SST) anomalies during September
2006 featured warmer than average temperature across the central and eastern
Pacific (Fig. T18).
Accordingly, the SST anomalies in the Niņo 4, Niņo 3.4 and
Niņo 1+2 regions remained
positive (latest values of 0.9, 0.7 and 0.9, respectively) (Table
T2). Meanwhile, for the fifth month in a row,
the Tahiti Darwin SOI is negative (latest value: -0.7), primarily in
response to higher than average pressure over Darwin (Table
T1, Figs. T1, T19).
oceanic thermocline, measured by the depth of the 20ēC isotherm along the
equator, featured above average depth across the equatorial Pacific during
September (Figs. T15,
with these conditions, equatorial oceanic temperatures at thermocline depth
were 2-3ēC above average throughout most of the Pacific (Fig.
September 2006, low-level westerly (easterly) anomalies (more than 3.0 m s-1)
were observed over the western equatorial Pacific (eastern
Suppressed convection (below-average rainfall amounts) was observed
enhanced convection (above-average rainfall amounts) was seen over the
western equatorial Pacific and western
T26 and E3).