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Oceanic Niño Index

Oceanic Niño Index:

The US National Oceanic and Atmospheric Administration has predicted an 83% probability of the Oceanic Niño Index (ONI) transitioning to a neutral range by April-June 2024.

  • Oceanic Niño Index is the primary indicator for monitoring the ocean part of the seasonal climate pattern called the El Niño-Southern Oscillation, or “ENSO”.
  • It tracks the running 3-month average sea surface temperatures in the east-central tropical Pacific between 120°-170°W, near the International Dateline, and whether they are warmer or cooler than average.
  • Index values of +0.5 or higher indicate El Niño and values of -0.5 or lower indicate La Niña.
  • El Nino and La Nina are two opposing climate trends that deviate from the normal conditions and normally run nine to twelve months, but can often extend.
  • These events occur every two to seven years on average (El Nino is more frequent than La Nina), but not on a regular basis and together are referred to as the El Nino-Southern Oscillation(ENSO) cycle by scientists.