Tropical Storm Erin has formed on a path toward the Caribbean and is expected to strengthen to a hurricane later in the week as it passes by Puerto Rico. Most models forecast the storm turning upward into the Atlantic Ocean, but a few see the storm continuing onward to the U.S. mainland.

Tropical Storm Erin is expected to strengthen into a hurricane later this week in the Atlantic Ocean, according to the National Hurricane Center.

Tropical Storm Erin is traveling westward across the Atlantic, where it's expected to intensify into a hurricane over the coming days. You can track it all with the maps below, including forecasts from the National Hurricane Center. And if you're seeking a more in-depth look at Erin, click here.