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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

NSW severe weather warning issued, damaging winds set to lash state's north

21:54 EST

Parts of New South Wales have been warned to prepare for wild weather overnight as a low-pressure system from Tasmania gets set to batter northern parts of the state.

SA weather: Power outages continue after three nights in the dark

21:53 EST

Power may not be restored to Eyre Peninsula homes until the early hours of the morning after twin tornadoes and wild weather caused significant damage to transmission towers in South Australia.

Concern for homes in South Australia as floodwaters rise, swollen rivers burst their banks

20:11 EST

Water levels have continued to rise in the Gawler River, with significant flooding occurring in the town and surrounding districts north of Adelaide.