According to the US National Hurricane Center, Bonnie is on a track to move across the southern tip of Florida.
The tropical storm, which formed south of the Bahamas, has maximum sustained winds of 64 kilometers per hour, said the advisory issued at 6:15 pm Miami time.
“Data from an Air Force Hurricane Hunter reconnaissance aircraft in the last hour indicate that surface winds associated with the depression have increased to 40 mph," the statement added.
It is expected to build strength as it bears down on the Florida Keys on Saturday, Jul 24.
With the tropical storm quickly approaching, the operations to plug the broken oil well in the Gulf of Mexico have been halted.
Ships around the regions have also been ordered to evacuate.
Meanwhile in Louisiana, the governor Bobby Jindal has declared a state of emergency as the storm is set to hit ths state on Sunday, Jul 25.