Melissa rapidly intensified going into Sunday morning and is now a Category 4 hurricane with 145 mph winds. The US National Hurricane Center expects it to strengthen into a rare Category 5 hurricane on Monday,

The slow-moving Melissa strengthened into a major Category 3 hurricane late Saturday as it threatened catastrophic flooding in the northern Caribbean.

The storm is moving at a worryingly slow pace -- just three miles (six kilometers) an hour -- which has meteorologists concerned that it will dump punishing rains on countries in its path for far long...