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.

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

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.

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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Hurricane Erin has re-intensified into a Category 4 storm on Sunday, with the U.S. National Hurricane Center warning of life-threatening surf and rip currents along the U.S. eastern seaboard this week.

Behind these storms, much cooler air arrives, and we begin the week with highs only in the mid-70s. It will be cloudy with scattered showers on Monday and Tuesday. By Wednesday, some sun returns with isolated thunderstorms and highs near 80.