Forecasters say there's still a lot of uncertainty about the path that Tropical Storm Isaac will take.

It's expected to head toward Florida as a hurricane by Monday, but the National Hurricane Center says some forecast models show it could go further west into the Gulf of Mexico.

Organizers of the Republican National Convention, which opens Monday in Tampa, are keeping an eye on it.

Forecasters say the storm is slowing down, and that will give it time to dump more rain on Puerto Rico. Isaac is churning up waves as high as 10 feet.

Forecasters say Isaac will likely turn into a Category 1 hurricane by tomorrow as it nears the Dominican Republic and Haiti. It's expected to weaken a little while heading over their island and Cuba, then possibly move on toward Florida as a hurricane by Monday.


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