Highlights – April 2014
During April 2014, sea surface temperatures (SSTs) were above-average across much of the eastern and central
equatorial Pacific (Fig. T18, Table T2). The latest monthly Niño indices were +0.2°C for
the Niño 3.4 region and -0.4°C for the Niño 1+2 region (Table
T2, Fig. T5).
However, a downwelling
oceanic Kelvin wave has produced a significant sub-surface warming across the
central and eastern equatorial Pacific during March and April. Consistent with
these conditions, the depth of the oceanic thermocline (measured by the
depth of the 20°C isotherm) was above-average across the central and eastern
equatorial Pacific (Figs. T15, T16),
with corresponding sub-surface temperatures being 2-6°C above average (Fig. T17).
during April, the low-level easterly trade winds remained near-average across
the equatorial Pacific (Table T1, Fig. T20). Meanwhile,
tropical convection remained enhanced over the west-central equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and
atmospheric anomalies reflect a continuation of ENSO-neutral conditions.
latest status of the ENSO cycle see the ENSO Diagnostic Discussion at: