Hurricane Melissa is forecast to become a major hurricane on Sunday with catastrophic flash flooding and landslides in Haiti, the Dominican Republic and Jamaica.

U.S. forecasters issued a hurricane warning for Jamaica as Tropical Storm Melissa threatened catastrophic flooding in the northern Caribbean.

"We will be very fortunate if Melissa does not cause a humanitarian disaster in the northern Caribbean next week," said Dr. Ryan Truchelut, chief meteorologist at WeatherTiger, who works with the USA...