Forecasters are tracking three systems in the Atlantic basin, including one with a medium chance of becoming a tropical depression later this week.

Forecasts nudge Erin's likely path to the west, increasing the risks at U.S. beaches. Experts say the storm's massive size, rather than its windspeeds, is what makes it a threat.

Hurricane Erin is beginning its upward movement along Atlantic coast, expected to be a few hundred miles off the coast of North Carolina by Aug. 21.

Hurricane Erin chugged slowly toward the eastern U.S. coast Tuesday, stirring up treacherous waves that already have forced dozens of beach rescues days before the biggest storm surges are expected. While forecasters remain confident the center of the monster storm will remain far offshore,