Tropical Storm Erin is quickly making its way across the Atlantic Ocean and is expected to strengthen over the next few days, according to the National Hurricane Center. The official intensity forecast released Tuesday morning shows the storm growing into the season's first hurricane with the potential to become a major hurricane by early Sunday.

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 formed in the eastern Atlantic Ocean on Monday, forecasters said. The storm was expected to strengthen later in the week and could become the Atlantic's first hurricane of the season.