The National Weather Service says Hurricane Bill poses a moderate risk for rip currents Friday morning and a high risk Friday afternoon.
Forecasters say the storm will produce large ocean swells as it moves north far off the coast. Those swells will increase throughout the weekend and the high rip current risk will continue into Sunday.
Rip currents are strong, narrow channels of water that flow out to sea.
Officials say swimmers who get caught in them should remain calm and swim parallel to the shore until they can break free.