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Preliminary Event Briefing - Tropical Cyclone Isaac

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On 17 August 2012 the National Hurricane Centre released its first weather outlook on a tropical wave system which had formed off the coast of Africa. By the following day the system appeared to be better organised as it moved towards favourable environmental conditions for development. At 0900 UTC on 21 August 2012 this system was classified as a Tropical Depression (#9) and by 2100 UTC it was upgraded to Tropical Storm Isaac.

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