Weather forecasts are beginning to look more clear, as Matthew swirls in the warm Caribbean waters now as a category 4 hurricane with sustained winds near 150 mph.. Here's what we're watching for the U.S. Hurricane Matthew threatens Caribbean, U.S. East Coast. Hurricane Matthew remains a powerful category 4 hurricane Sunday, and is on the move northward toward Jamaica, Hispaniola and Cuba -- with forecasters saying there is a possibility of a U.S. impact as well.