NINO3.4 Index

  • index
  • SOI
  • NINO3.4

The NINO3.4 index is one of several El Niño/Southern Oscillation (ENSO) indicators based on sea surface temperatures.

NINO3.4 is the average sea surface temperature anomaly in the region bounded by 5°N to 5°S, from 170°W to 120°W. This region has large variability on El Niño time scales, and is close to the region where changes in local sea-surface temperature are important for shifting the large region of rainfall typically located in the far western Pacific.

An El Niño or La Niña event is identified if the 5-month running-average of the NINO3.4 index exceeds +0.4°C for El Niño or -0.4°C for La Niña for at least 6 consecutive months.

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Weather News

Cyclone Trevor strengthens to category three as it nears Far North Queensland coast

08:22 EDT

Severe Tropical Cyclone Trevor is now a category three system and could intensify further before it makes landfall tonight, the Bureau of Meteorology has said.

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This briefing is compiled by the ABC's digital journalists in Sydney.

Tropical Cyclone Trevor forms off Far North Queensland coast as storms hit the south east

01:03 EDT

Tropical Cyclone Trevor is expected to intensify to a category three system before it crosses Queensland's Cape York Peninsula on Tuesday night.