Forecasters say Tropical Storm Erin is "moving quickly" as it strengthens and heads toward the western hemisphere, but U.S. weather officials say it's too early to tell what impact it will have.

Forecasters say Tropical Storm Erin is "moving quickly" as it strengthens and heads toward the western hemisphere, but U.S. weather officials say it's too early to tell what…

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