Answer
Leave at the first thunder or lightning and wait for a clear interval per Beach Patrol and National Weather Service guidance—do not linger under umbrellas. Metal poles and open sand are unsafe. Indoor lodging is the real shelter.
Sources: Town of Ocean City Beach Patrol · Visit Ocean City · National Weather Service
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.
