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El Niño Declared Active as Satellites Track a Large Pacific Heat Pulse

Satellite plus forecast data suggest the event will likely strengthen this year, raising the odds of major shifts in temperature and rainfall that could strain food and water systems.

Overview

  • U.S. forecasters at NOAA confirmed El Niño is active on June 11 and gave about a 63% chance it will reach ‘very strong’ levels by November–January according to the latest ensemble outlooks.
  • NASA and the Sentinel‑6 Michael Freilich satellite recorded unusually high sea surface heights on June 8 that reveal a deep subsurface reservoir of warm water and eastward Kelvin waves, conditions that often precede powerful El Niño events.
  • Major forecast centers including the WMO, ECMWF and national meteorological services have raised odds of a strong or ‘super’ event but warn peak strength and local impacts remain uncertain because models diverge and seasonal predictability is limited.
  • Humanitarian and market responses have shifted to preparedness with UN food agencies and the WFP launching a $202 million anticipatory appeal while Risilience models estimate up to $342 billion in potential crop losses and acute risk to roughly 500 million smallholder farmers.
  • Forecasters expect regionally varied effects with wetter conditions for parts of the southern United States and southern South America and drought risk for Australia, Indonesia and parts of Asia, including a likely weakening of India’s monsoon that could cut yields and push food prices higher.