---
title: An eddy off the Sydney coast could trigger a marine heatwave
description: An eddy off the Sydney coast could trigger a marine heatwave
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# An eddy off the Sydney coast could trigger a marine heatwave

A colossal eddy, a rotating vortex of seawater, is forming off the coast of Sydney, Australia. Estimated to be 400km wide, this eddy holds 30% more heat than usual for the region, with temperatures 3°C above normal. If it moves closer to the shore, it could trigger another coastal marine heatwave. Eddies are large, powerful rotating bodies of water that can influence ocean currents and marine ecosystems. The situation emphasises the need to better understand the growth, movement, and impact of eddies, as they can store significant heat and temporarily elevate coastal sea levels. ([The Guardian)](https://www.theguardian.com/australia-news/2023/nov/02/eddy-current-pacific-ocean-sydney-australia-explained)

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