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.
Shoalhaven oyster farmers face hundreds of thousands of dollars in losses as floods wash away salinity
Oyster farms flooded in this week's downpour at Greenwell Point on the New South Wales south coast could lose hundreds of thousands of dollars' worth of oysters.
The Bureau of Meteorology says spring could be wetter than normal for much of western and central Australia.
A moisture laden southerly flow directed by an East Coast Low interacted with an upper cold pool over parts of Victoria yesterday producing persistent and heavy showers.