NINO3.4 Index
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
Morning storms threatening Darwin
10:29 EDT
A line of showers and thunderstorms moving over the Northern Territory's Top End may reach Darwin later this morning.
Powerful low pressure system buffeting southeastern Australia
09:12 EDT
Damaging winds are lashing parts of southeastern Australia today, fanning bushfires and felling trees.
Dust storm hits Sydney, NSW Government issues air quality warning
00:23 EDT
A dust storm that has swept across drought-stricken parts of New South Wales has shrouded Sydney's landmarks and sparked an air quality warning from the State Government.
