sea surface temperatures (SSTs) during June 2007 were near-average across
the western and central equatorial Pacific and colder-than-average over the
eastern tropical Pacific (Fig. T18).
This pattern is reflected in negative values of the Niņo 1+2
(-1.4) and Niņo 3 (-0.5) region SST indices (Table
Darwin SOI became
slightly positive (latest value: +0.2) for the first time since
December 2006 (Table T1,
These conditions indicate a continuation of ENSO-neutral conditions.
equatorial oceanic thermocline during June, measured by the depth of the 20ēC
isotherm, featured a continuation of below-average depths over the eastern
equatorial Pacific and near-average depths across the western and central
equatorial Pacific (Figs. T15,
T16). As a result, temperatures in the eastern
equatorial Pacific remained generally 1-3ēC below average at thermocline
depth (Fig. T17).
June 2007, low-level easterly anomalies (more than 3.0 m s-1)
were observed across the tropical
western and central equatorial Pacific (Fig.
T20). The latter anomalies have persisted
since February (Fig. T13),
and are consistent with the shallower-than-average thermocline farther east.
This wind pattern was also associated with enhanced convection
(above-average rainfall amounts) across
a continuation of suppressed convection (below-average rainfall amounts)
across the central and eastern equatorial Pacific (Figs. T25, E3).
the latest status of the ENSO cycle see the ENSO Diagnostic Discussion at: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/index.html