Tropical Storm Maria was upgraded to a category one hurricane force on Sunday by the US National Hurricane Center.
The storm is currently following roughly the same path as Irma.
As a result, hurricane warnings have been issued for the US and British Virgin Islands, as well as Puerto Rico.
They were all hit by Hurricane Irma - the category five storm which left at least 37 people dead and caused billions of dollars worth of damage - earlier this month.
France has also issued a hurricane warning for its territory of Guadeloupe.