Forecasters are watching a new tropical system that may form behind Hurricane Erin, which is intensifying again Monday as it tracks off the U.S. coast.

Hurricane Erin has weakened slightly overnight but remains a very strong storm with winds well over 120 mph, making it still a major hurricane. The track remains mostly unchanged. It will start making that northern turn in the next 24 hours.

Hurricane Erin is expected to bring life-threatening surf and rip currents across the U.S. eastern seaboard this week, according to the National Hurricane Center. It is now a Category 4 storm with maximum sustained winds of 130 mph.

Forecasters said Erin should begin to slowly weaken as it increased wind shear. However, it's predicted to remain a major hurricane until late next week.

Hurricane Erin is forecast to remain well offshore but still bring hazardous currents and possible erosion like previous offshore hurricanes before it.

Hurricane Erin continues to churn in the Atlantic as it looks to swing north and away from the U.S. coastline. It is now a Category 3 storm with maximum sustained winds of 125 mph. This is the first hurricane of the 2025 season in the Atlantic, according to the National Hurricane Center.