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

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

August 16: 11:20AM AST @53rdWRS find #Erin is now a Category 5 Hurricane with maximum sustained winds of 160 mph. Visit https://t.co/tW4KeGdBFb for the latest pic.twitter.com/dEZuREiUa3 ...