Tropical Storm Erin continues to move westward across the Atlantic as it is expected to become a hurricane in a couple of days, the National Hurricane Center said.

There is growing confidence that Tropical Storm Erin will curve north early next week as it approaches the Caribbean and U.S. East Coast, potentially sparing those areas the worst impacts of what could be a powerful storm.

The storm is expected to become a hurricane this week and a major hurricane this weekend. Here’s what we know about it.