A tropical storm brewing in the Caribbean Sea is threatening to derail the Republican Party's national convention, with organisers saying they are working closely with local emergency officials.
Tropical Storm Isaac is dumping torrential rain on Puerto Rico and the US Virgin Islands and forecasters expect it to become a category one hurricane within the next 24 hours.
There is a chance it could disrupt the Republican Party's national convention next week when 50,000 people descend on Tampa in Florida to formally nominate Mitt Romney as the presidential candidate.
Convention organisers say they are in regular contact with the National Weather Service and local emergency officials in an effort to track the potential impact of the storm.
Florida's governor has told Republicans they have enough resources at hand to deal with it if it makes landfall near Tampa.
© ABC 2012
18:25 EST Rain is on the way for the North West Slopes and Plains and the Northern Tablelands.