NCL posts weather alerts and itinerary changes on its home page,
Norwegian Cruise Line - then click on the yellow icon on the left marked "Weather Alert."
To keep this more manageable, we will post only major changes. For minor itinerary changes (such as cancellations of tender ports), we ask that you consult NCL's page.
The only cruise, so far, affected significantly by Hurricane Irene is
Norwegian Gem. Please see above link.