The storm is large and powerful, but it is expected to turn away from the East Coast of the United States. Here’s what to know about the storm’s projected path, and how it could change.

Tropical Storm Erin is slightly intensifying and forecast to become a hurricane Friday with a chance of ultimately affecting the U.S. East Coast next week.

The storm’s likely path is coming into focus, but a lot can still change. Here’s what the forecasters look at.