From the NOAA/PMEL/TAO website.
The links below can be used to keep track of important developments across the Pacific Basin.
The Weekly Tropical Climate Note issued by the Darwin office of the Bureau of Meteorology discusses the main features of the tropical atmosphere and ocean, including the intra-seasonal oscillation or 30-60 day wave which is thought to sometimes impact on the development of El Niño events.
The Bureau of Meteorology Research Centre (BMRC) has recently developed maps of Out-going Longwave Radiation (OLR), a useful El Niño monitoring tool. Negative anomalies show areas which, in general, have been cloudier (and potentially wetter) than normal.
The TAO / TRITON data display page is excellent for creating your own plots of numerous variables that are relevant to El Niño.
Note however that information coming from other countries is likely to describe timing and impacts relevant to those countries, which will not be the same as those in Australia.
El nino,La nina