How it works
The wiggly blue line in the central Pacific Ocean put us in La Nina, pushing tropical moisture towards Australia. That blue is gradually weakening week by week, as we head into a Neutral state.
The Indian Ocean will start to strike an imbalance as we move into Autumn.
The brown area indicates "El Nino". On the Sea Temperature Anomaly map there would be a warm wiggly line, offset by cool water off Queensland. This would encourage the Pacific Ocean to send the tropical moisture away from Australia.
The green area indicates "La Nina". Warm water off Queensland and cool water in the wiggly line, so the Pacific Ocean sends tropical moisture towards Australia.
La Nina encourages rain in Australia, but you need low pressure to turn the moist air into rain. The following graphs tell us more about that.
El Nino makes it much harder for low pressure to deliver rain, as there is a limited supply of moisture.
Understanding the weather
A four part series on how best to Understand the Weather.
Read these after you have conquered the basics!