Tropical Storm Erin formed Monday morning in the eastern Atlantic Ocean and forecasters expect it to become the first hurricane of the Atlantic season this week.

Tropical Storm Erin formed in the eastern Atlantic Ocean on Monday, forecasters said. The storm could strengthen to become the Atlantic's first hurricane of the season.

A hurricane might form in the Atlantic Ocean by the end of this week, according to the National Weather Service. The storm, which would be named Hurricane Erin, has a 90% chance of becoming a cyclone within the next seven days.