Answer
Yellow and red flags signal elevated surf and current risk even under sunny skies. Double-red means water closed to swimming—often after rescues, lightning, or dangerous rip fields. Flags can upgrade mid-afternoon when wind shifts; re-walk to your stand before every new swim session.
Sources: Ocean City Beach Patrol · Town of Ocean City
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
