Answer
Beach Patrol may warn swimmers or suggest relocating a few blocks when dense jellies stack in the wash, but closures usually track surf and lightning more than jellies alone. Still, a red-flag day plus nettles is a definite pool afternoon.
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.
