-- In two separate new travel warnings, the U.S. government urged citizens to leave Haiti and the Bahamas before Hurricane Matthew strikes, warning that "there is limited time available for a safe departure."
"Given the approaching hurricane, there is limited time available for a safe departure," the warning reads, before going on to recommend those citizens who are unable to depart to seek shelter.
Matthew's sustained winds have decreased in speed by 10 mph since Saturday morning, but ABC News meteorologist Daniel Peck said the hurricane is still moving westward toward Jamaica and Haiti.
"This still looks like a high-impact event for Jamaica and Haiti," Peck said. "We expect conditions to deteriorate in Jamaica and Haiti by Sunday night, early Monday morning, with the worst impacts throughout the day on Monday and into Monday night."
Rainfall totals of 10 to 15 inches with maximum sustained amounts of 25 inches are expected across Jamaica as well as southern and southwest Haiti.
The U.S. embassy in Kingston, Jamaica, announced Friday that its consular services section will be closed on Monday and Tuesday in anticipation of the storm.
The storm was initially expected to lose some strength as it makes landfall in Cuba and moves into the Bahamas. But the latest forecast shows that Matthew could maintain or even strengthen slightly as it passes over the Bahamas by Wednesday or Thursday.
As for the United States, most forecasts keep the weather system east of Florida and only a few show it hitting the Sunshine State by the middle of next week.
"We cannot completely rule out at this point that Matthew could impact Florida or parts of the Southeast coast in some way," Peck said.
Matthew developed very quickly from a tropical wave into a tropical storm with maximum sustained winds of 60 mph around 11 a.m. ET Wednesday. The only other storm that has done this was Hurricane Debbie in 1961, according to ABC News meteorologist Max Golembo.
As the weather system moved over the eastern Caribbean, Matthew brought wind gusts ranging from 50 mph to 60 mph from Dominique to St. Lucia and Barbados. The islands saw heavy rainfall of up to 3 inches, causing landslides and flash flooding. The landslides were so severe that one person was killed by a boulder in St. Vincent.
ABC News' David Caplan, Max Golembo, Melissa Griffin, Daniel Manzo, Kirit Radia, Daniel Peck, and Catherine Thorbecke contributed to this report.