Queensland’s devastating floods are the result of heavy rains caused by two normally unconnected weather phenomena.
La Niña is a seasonal interaction between the Pacific Ocean and the Earth’s atmosphere to the east of Australia.
The trade winds, the prevailing pattern of easterly winds in the tropics, force warmer water to "pool" in the western Pacific.
This warm water is trapped off the Australian coast, fuelling cloud development and rainfall.
To the northwest of Australia, the annual monsoonal low pressure trough brings wet weather and heavy rain to the region.
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