Forecasters predicted that Tropical Storm Ian, which developed late on Friday over the central Caribbean Sea, will grow on Sunday and become a hurricane.
On Sunday night, Ian was located approximately 430 miles southeast of the western point of Cuba, and by Monday.
Jamie Rhome, the interim director of the National Hurricane Center, said in a Sunday briefing that Hurricane Ian would be "big and strong" in the eastern Gulf of Mexico .
On Sunday, the Hurricane Center issued a hurricane warning for parts of western Cuba, where "life-threatening storm surge and hurricane-force winds".
It warned on Sunday that "efforts to preserve life and property should be hurried to completion."
Some Florida school districts made the decision to close their campuses in advance of the hurricane.