The tropical wave we've been tracking in the Central Caribbean was tagged Invest 99-L on Tuesday afternoon. It will likely become a tropical depression by the end of the week. As the system moves into the western Caribbean Sea,

The Caribbean is just on the cusp of seeing Tropical Storm Sara form to the west, according to the latest data from the National Hurricane Center.

National Hurricane Center forecasters say there's a 70% chance that a system develops over the southwestern Caribbean Sea over the next two days.