Florence is now a post-tropical cyclone, the U.S. National Hurricane Center (NHC).
Hurricane Florence would deliver a "direct hit" to the US East Coast, emergency officials warned on Tuesday.
Florence, a Category 4 hurricane, is growing in size and strength and is expected to strengthen into an extremely dangerous storm through Thursday.
Tropical Depression 17 has formed over the Eastern Atlantic and is expected to strengthen into a tropical storm later on Monday.
The core of Hurricane Maria is expected to reach the southeastern coast of Puerto Rico on Wednesday morning .
Hurricane Harvey has set what forecasters believe is a new rainfall record for the continental United States, officials said Tuesday.