Hurricane Erin isn't the only game in town. Forecasters are also monitoring two other tropical systems in the Atlantic Ocean on Aug. 19 as the heart of the hurricane season approaches.

Hurricane Erin is located a few hundred miles off the coast of Florida and is moving slowly to the northwest, the National Hurricane Center said. Although the storm center is expected to remain offshore, large waves and rough surf driven by the powerful hurricane were expected to pound the Atlantic Coast from Central Florida to Canada.

Much farther to the east in the central Atlantic, a tropical wave could become a tropical depression toward the end of the week or over the weekend as it moves west toward the United States and Caribbean.

More: What does fierce Hurricane Erin mean for the rest of the season?

And yet another tropical wave off the coast of Africa has a low chance for development but has been designated as "Invest 99L" by the hurricane center.