of global tropical sea surface temperature (SST) during July 2005 featured
near-average SSTs everywhere, except positive anomalies in the tropical
. The warmth in the tropical
has been a persistent feature during the last several months. The SST
anomaly in the Niņo 3.4 region remained positive during July (latest value
0.5) while the Niņo 1+2 anomaly was -0.6 (Fig. T18,
Table T2). The oceanic thermocline, measured
by the depth of the 20°C
isotherm, featured near-average depth across the equatorial Pacific during
July (Figs. T15, T16).
Consistent with these conditions, oceanic temperatures at thermocline depth
were near average throughout most of the equatorial Pacific (Fig. T17).
The Tahiti - Darwin SOI has been near zero for the last two months (Table
T1, Fig. T1). The overall
patterns of convection, SST, low-level winds and upper-level winds were near
average over central and eastern tropical Pacific during July, which is
consistent with ENSO-neutral conditions.
precipitation was observed over
, the western tropical Pacific (north of
Papua New Guinea
), and the
Gulf of Mexico
(Fig. T26, Fig.
E3). The former are consistent with enhanced
convection associated with the development of the Asian summer monsoon
system (Fig. T25), while the latter is
consistent with the very active start to
the Atlantic hurricane season.