Hurricane Ivan is now at Category 4 strength, according to the National Hurricane Center.
The hurricane is moving toward the southern U.S. and the Bahamas, with maximum sustained winds of 75 mph.
The center expects Ivan to strengthen into Category 5 on Wednesday.
Hurricane Ivan has sustained winds up to 100 mph, making it one of the strongest hurricanes to make landfall on land in the Atlantic Ocean in more than a decade.
It is the most powerful hurricane ever recorded in the area.
Ivan is forecast to strengthen and potentially make landfall in Puerto Rico and the Dominican Republic by Wednesday night.
The storm is expected to weaken and make landfall over the Bahamas by Wednesday evening.
The center is forecasting a Category 4 hurricane in the central Bahamas and Tropical Storm Nate by Wednesday morning.
The tropical storm could bring heavy rainfall and strong winds, and possibly some coastal flooding.
The National Hurricane Centers forecast that Nate will bring winds of up to 75 mph to the Bahamas on Wednesday night, and winds of 65 mph to Puerto Rico by Friday morning.
Tropical Storm Nathan, which is forecast as a Category 2 hurricane by the National Weather Service, is forecasted to make its landfall near the coast of Jamaica on Wednesday evening, making landfall as a tropical storm on Friday morning and damaging roads and infrastructure.