I'm going to make a very early and quick forecast for Gustav. I dont see any reason why this wont head to the western gulf of mexico. The trough coming thru later this week into the weekend is just going to be too weak as most of its energy will be going thru the great lakes and new england.
With that said, This system is a threat from Lake Charles, LA - northern Mexico. A strong ridge is forecasted to remain over the eastern U.S. thru early next week and this pattern has been consistant.
The only slim chance this will affect S Florida is for this to move far enough north in the next 24-36hrs to be at least 100 miles north of Cuba, This is highly unlikely due to the ridging over the central bahamas.

scottsvb