The pattern of global tropical
sea surface temperature (SST) during August 2005 featured near-average SSTs
everywhere, except positive anomalies in the tropical North Atlantic. The
warmth in the tropical North Atlantic has been a persistent feature during
the last several months (Fig. T18, Table T2).
The overall patterns of convection, SST, low-level winds and upper-level
winds were near average over the central and eastern tropical Pacific during
August (Figs. T18, T20,
T21 and T25),
which is consistent with ENSO-neutral conditions.
The oceanic thermocline,
measured by the depth of the 20°C isotherm, featured near-average depth
across the equatorial Pacific during August (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 (latest value -0.8, Table T1,
Fig. T1) was negative, primarily in response to
higher-than-average pressure over Darwin.
Excessive precipitation was observed over the
western tropical Pacific and the Gulf of Mexico/North Atlantic (Fig. T26,
Fig. E3). The latter is consistent with the
very active Atlantic hurricane season.