Answer
Operators pause rides when lightning threatens—Atlantic summer cells move fast. Have a rainy-day arcade backup in mind; ocean-city-indoor-activities lists options when the Pier deck closes.
Sources: National Weather Service · Jolly Roger Amusement Park · 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.
