Spaghetti models for Tropical Storm Melissa. See expected path. Special note about spaghetti models: Spaghetti model illustrations include an array of forecast tools and models, a

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

“The rainfall is a huge risk with the storm,” said Michael Brennan, director of the U.S. National Hurricane Center in Miami.