Tropical Storm Melissa is expected to bring days of heavy rain to the Dominican Republic, Haiti and Jamaica and may trigger life-threatening flash flooding, the National Hurricane Center says.

Melissa is slowly organizing but still dealing with some wind shear in the Caribbean. The storm will continue to slow down in this region over the next few days, leading to a high flash flooding threat for places like Haiti,

Tropical Storm Melissa's forecast is filled with uncertainty, prompting some dire worst-case scenarios for Caribbean islands.