Tropical storm Isaac, which is churning through the Caribbean, could strike Florida, hurricane forecasters say, triggering concern it might force a postponement or cancellation of the Republican National Convention in Tampa next week.

It is still too early to predict whether the storm could make a direct hit on the city. Forecast models show Isaac's center following a path that could take it as far west as the Gulf of Mexico and as far east as the Atlantic Ocean by next Monday.

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