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NOAA: ENSO-Neutral Expected Through the Northern Hemisphere Spring, Then 62% chance of El Niño during May-July 2023

By: Diana Delgado, Contractor

NOAA: ENSO-Neutral Expected Through the Northern Hemisphere Spring, Then 62% chance of El Niño during May-July 2023

 
Diana Delgado
Latin American correspondent
diana.delgado@stonex.com

NOAA: ENSO-Neutral Expected Through the Northern Hemisphere Spring, Then 62% chance of El Niño during May-July 2023

Coffee Network (Bogota) - According to the latest forecast from NOAA, during the last month, above-average sea surface temperatures (SSTs) became more prominent in the western and far eastern equatorial Pacific Ocean, claiming that transition to El Niño is beginning June-August 2023 and persisting into the winter.

 The latest weekly Niño-3.4 index value was 0.0ºC, but the Niño1+2 index value was +2.7ºC, indicating significant warming along the South American coast.  Area-averaged subsurface temperatures also increased over the past month, reflecting the dominance of above-average subsurface temperatures across the equatorial Pacific Ocean.  For the monthly average, upper-level and low-level winds were near normal across most of the equatorial Pacific Ocean.  However, low-level westerly wind anomalies were evident in the first half of March associated with sub-seasonal activity.  Suppressed convection was evident over the central tropical Pacific and over parts of Indonesia. While the warming near coastal South America was striking, the basin-wide coupled ocean-atmosphere system was consistent with ENSO-neutral.

​The most recent IRI plume favors a transition to El Niño, beginning June-August 2023 and persisting into the winter .  While the lower accuracy of forecasts during the spring can result in surprises, the recent oceanic Kelvin wave plus recurring westerly wind anomalies are anticipated to further warm the tropical Pacific Ocean.  The coastal warming in the eastern Pacific may foreshadow changes across the Pacific basin.  Therefore, an El Niño Watch has been issued, and the range of possibilities toward the end of the year includes a strong El Niño (4 in 10 chance of Niño-3.4 ³ 1.5°C) to no El Niño (1 in 10 chance).  In summary, ENSO-neutral conditions are expected to continue through the Northern Hemisphere spring, followed by a 62% chance of El Niño developing during May-July 2023 .

By Diana Delgado

  • Coffee

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