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NINO3.4 Index
The NINO3.4 index is one of several El Niņo/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 Niņo 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 Niņo or La Niņa event is identified if the 5-month running-average of the NINO3.4 index exceeds +0.4°C for El Niņo or -0.4°C for La Niņa for at least 6 consecutive months.
Southern Oscillation Index
Nino3.4 Index
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Can auroras affect aeroplanes?
13:01 AEST Auroras lit up the skies on the weekend amid one of the strongest geomagnetic storms in years, but did this display impact aeroplanes and the aviation industry? The spectacular exhibit was the aurora borealis/australis, or northern and southern lights seen in both hemispheres.
- 11:00 AEST May day heat record to tumble in Perth
- 13:26 AEST More rain and storms for WA
- 13:03 AEST Welcome wet weather in parched western Tasmania this week
- 11:24 AEST Relief ahead for drenched NSW coast
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