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.
A gusty cold front has brought gusty winds and showers to southern SA, western VIC and southern NSW.
Northern Australia has an above average chance of experiencing an early start to the wet season according to data released today by the Bureau of Meteorology.
It's going to be a mixed bag of weather around the country on Saturday as voters head out to decide who next we can make fun of in cartoons, watch being interviewed on a brisk dawn walk, or hear them say 'jobs and growth' again and again.