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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

Cyclone Debbie downgraded to category two system; Collinsville residents told to brace for storm

21:03 EDT

The full devastation brought on by Tropical Cyclone Debbie will not be known until the morning, Queensland Premier Annastacia Palaszczuk has warned, as the system is further downgraded to a category two.

Cyclone Debbie downgraded to category two but threat remains, Premier says

20:58 EDT

Cyclone Debbie has been downgraded to a category two system after crossing the north Queensland coast.

Cyclone Debbie's eye reaches coast; BOM downgrades system to category three

20:34 EDT

Tropical Cyclone Debbie has been downgraded to a category three system, having made landfall along the north Queensland coastline near Airlie Beach earlier this afternoon as a slow-moving category four system.