I really hope not, or our first ever trip to Coz or the Caribbean for my birthday may be ruined. Is shore diving at least an option? We could at least do that.
Does the ferry still run, or we won't be able to get to the island?
No worry, you can still get in diving. It's just the ports that are closed (extremely rare the ferry is shut down).
Ferry still runs, east coast dive boats are available and so is shore diving.
Shore diving during a Norte is an easy option (edit: if you are an experienced shore diver, oriented to the local environment and trained and equipped for the condition.) many of us enjoy.
Just choose some of the sites with sheltered entry points. If your dive op is knowledgeable they should be able to advice you on this.
Otherwise, book on the dive boats positioned on the lee side of the island or take a ferry to dive the mainland is also possible. The cenotes have beautiful cavern zones. It's a little colder feeling with the north wind so I wear my thicker wetsuit.
Enjoy paradise, in a norte its still much better conditions, easier entry and warmer than back home.
Cameron