Beachgoers should know that dangerous rip currents are expected Thursday morning through evening along Atlantic Ocean shores, with a "high risk" advisory issued, the National Weather Service said.

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The surf height is predicted to be in the range of 2 feet to 4 feet.

Rip currents are powerful water channels flowing quickly away from shore, the service said. Swimmers should heed flags and posted signs and swim only in areas with lifeguards.