 Isobel was downgraded to a tropical low shortly after landfall over the Eighty Mile Beach on 3 January and advisories were stopped at 0600 UTC that morning.The remnants of Isobel merged with a deep low pressure system near the southern coast of Western Australia, dumping 100 mm of torrential rain, in what was dubbed a "perfect storm".The extratropical system halted mining operations and unleashed winds of up to 120 km/h.