Erin, the first hurricane of the season, exploded to a Category 5 hurricane Saturday, and despite fluctuations in intensity, the storm is remaining formidable this weekend. Here's where it could head in the week ahead.

Hurricane Erin is now a Category 5 storm, the highest on the class, rapidly intensifying overnight into early Saturday morning as it threatens the Leeward Islands and Puerto Rico, then will move along the U.

Erin was a Category 3 hurricane Sunday morning, the National Hurricane Center said in its 8 a.m. update, with sustained winds of 125 mph, with tropical storm-force winds reaching out 205 miles.