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 was a Category 4 storm again Monday morning and is expected to grow even larger and stronger, according to the latest advisory from the National Hurricane Center. Although Erin is forecast to move north between the U.S. and Bermuda, life-threatening surf and rip currents are likely across the Atlantic coast from Florida to Canada.

After exploding in strength at a historic rate this weekend, Hurricane Erin is now a sprawling Category 4 storm churning in the Atlantic. The storm’s enormous footprint is becoming the biggest concern as it threatens to drive life-threatening rip currents and towering waves toward the eastern US coastline and Bermuda.

Hurricane Erin has reintensified into a Category 4 storm on Aug. 18, according to the National Hurricane Center. See where Erin is headed.

Coastal flood and beach erosion are also possible this week as Hurricane Erin passes far off the Jersey Shore.

Hurricane Erin on Monday reinvigorated as a major Category 4 storm as it moves near the Bahamas while the National Hurricane Center increased the odds a system following in the Atlantic could

Local officials say they only order evacuations ahead of hurricanes when it’s necessary to protect the public.

The storm will remain a major hurricane through the middle of the week, according to the National Hurricane Center.

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