Highlights - October 2021
2021, sea surface
temperatures (SSTs) were below-average across much
of the equatorial Pacific (Fig. T18). The latest monthly Niņo indices were -0.2°C for
the Niņo 1+2 region, -0.8°C for the Niņo 3.4 region and -0.7°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 eastern equatorial Pacific (Figs. T15,
corresponding sub-surface temperatures were 1-7°C below-average (Fig. T17).
Also during October, the
lower-level easterly winds and the upper-level westerly winds were above-average
over parts of the equatorial Pacific (Table
T1, Fig. T20, Fig. T21). Meanwhile,
tropical convection was suppressed near and west of the Date Line (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: http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/index.html