Hurricane Erin is expected to bring massive waves and dangerous rip currents to areas along the East Coast. Here's which beaches are closed.

(Reuters) -Hurricane Erin has re-intensified into a category 4 storm on Sunday after completing an eyewall replacement cycle, with the U.S. National Hurricane Center warning of life-threatening surf and rip currents along the U.

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 windspeed, is what makes it a threat.