TRENTON, N.J. — Tropical storm warnings that were issued for shore towns as Hermine headed toward the state were lifted Monday, but forecasters still warned of dangerously high seas.

The National Hurricane Center said waves as high as 10 to 14 feet were possible.

The tropical storm warnings for Jersey shore towns were replaced Monday morning by a coastal flood advisory, which was scheduled to remain in effect until 5 a.m. Tuesday.

Forecasters said minor coastal flooding was anticipated during the morning and evening high tide cycles Monday. Strong winds also were expected throughout the day, with sustained winds of about 20 to 30 mph and gusts reaching as high as 40 mph.

The change came as Hermine continued to twist hundreds of miles offshore in the Atlantic Ocean. The storm system was still expected to keep swimmers and surfers out of beach waters because of its dangerous waves and rip currents, and storm surge and beach erosion remained concerns.

The improved forecast for New Jersey spurred Republican Gov. Chris Christie to reopen Island Beach State Park on Monday, though it was likely that beachgoers would still be kept out of the water because of the rough waters and rip currents.

The beach, one of the state’s most popular, had been closed for most of the holiday weekend because initial forecasts called for more severe weather conditions.

Big waves and churning surf up to the base of dunes were reported in some areas of the state that were hit hard by Superstorm Sandy in October 2012, including the Ocean County communities of Point Pleasant Beach, Bay Head, Mantoloking and Brick. But no flooding or other damage was reported in those areas.