Erin, which quickly strengthened into a Category 5 storm on Saturday, is not expected to make landfall in the U.S., but experts remain on alert.

Erin, the first hurricane of the season, is now forecast to become a Category 4 by Sunday. Here's where it could head in the week ahead.

The U.S. could see the landfall of its first hurricane this year in the coming weeks, as Tropical Storm Erin continues to build in the Atlantic. Current projections see the storm developing into a hurricane sometime in the next few days as it moves west across the ocean,

A westward-moving tropical wave could produce an area of low pressure in the tropical Atlantic late in the week of Aug. 18, the hurricane center said on Aug. 16. The center shows a 20% chance of storm formation over the next week.