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.

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

Hurricane Erin has undergone a period of astonishingly rapid intensification — a phenomenon that has become far more common in recent years as the planet warms. It was a rare Category 5 on Saturday before weakening,

For people living along the Delaware River, 1955 has become the measuring stick for flooding and property damage. The highwater mark of 43.7 feet at Easton caused by Hurricane Diane on Aug. 18-19, 1955, remains a record. But it is not alone. A series of three major floods between 2004 and 2006 similarly shocked the region.

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

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