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During winter in Australia low pressure storms are generated in the Indian and Southern Oceans, whipping up huge seas and creating severe cold fronts which sweep across southern and eastern Australia.This caused a thunderstorm with winds of 100+km/hr in South Australia. Those winds lifted the dust from dessicated outback and marginal lands. Just as happened in the thirties in North America (and Australia too, for that matter), the soil was loosened and blew east into Queensland and New South Wales.
....dust storms are usually restricted to the inland of Australia. Occasionally, during widespread drought they can affect coastal areas. Australia is battling one of its worst droughts and weather officials say an El Nino is slowly developing in the Pacific which will mean drier conditions for Australia's eastern states.