Melissa is undergoing extreme rapid intensification and is a Category 4 hurricane with 140 mph winds Sunday morning.

Tropical Storm Melissa has become a hurricane and is expected to strengthen into at least Category 4 intensity, the U.S. National Hurricane Center said on Saturday.

“This extreme rainfall potential, owing to the slow motion, is going to create a catastrophic event here for Jamaica,” US National Hurricane Center (NHC) Deputy Director Jamie Rhome said in a webcast...