Highlights - January 2021
2021, sea surface
temperatures (SSTs) remained below-average across the
central and eastern equatorial Pacific (Fig.
T18). The latest monthly Niņo indices were -0.8°C for
the Niņo 1+2 region, -1.1°C for the Niņo 3.4 region and -1.2°C for the Niņo 4 region (Fig. T5, Table T2). The depth of
the oceanic thermocline (measured by the depth of the 20°C isotherm) was below-average
across the central and eastern equatorial Pacific (Figs. T15, T16). The corresponding sub-surface
temperatures were 1-3°C below-average (Fig.
Also during January, the
lower-level easterly winds were above-average across the western and east-central
equatorial Pacific and the upper-level westerly winds were above-average over
much of the equatorial Pacific (Fig. T20, Fig. T21). Meanwhile,
tropical convection continued to be suppressed over the western and central
equatorial Pacific and enhanced over Indonesia (Figs. T25, E3). Collectively, these oceanic and
atmospheric anomalies were consistent with La Niņa conditions.
For the latest status of the ENSO
cycle see the ENSO Diagnostic Discussion at: