Some fluctuations in intensity are expected over the next couple of days due to inner-core structural changes.

Erin barreled through the Atlantic as a “formidable” Category 4 hurricane near Puerto Rico, after earlier reaching the top of the five-step, Saffir-Simpson scale.

Hurricane Erin raced from a Category 1 to a Category 5 storm. If Erin keeps ramping up, is there a Category 6?

Hurricane Erin has intensified to a Category 5 storm, prompting flash flood warnings in the Caribbean. With winds of 160 mph, ...