Tropical Highlights - April 2025

 

During April 2025, sea surface temperatures (SSTs) were near-average across much of the equatorial Pacific (Fig. T18). The latest monthly Nino indices were +0.6C for the Nino 1+2 region, -0.2C for the Nino 3.4 region and -0.2C for the Nino 4 region (Table T2). The depth of the oceanic thermocline (measured by the depth of the 20C isotherm) was slightly below-average across the central and east-central equatorial Pacific (Figs. T15, T16).

 

Also during April, lower-level and upper-level winds were near average across the equatorial Pacific (Figs. T20, T21). Meanwhile, tropical convection was suppressed around the Date Line and was enhanced near Indonesia (Fig. T25). Collectively, these oceanic and atmospheric anomalies were consistent with ENSO-neutral 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