The first hurricane in the 2010 Atlantic season has formed in the Gulf of Mexico. Due to the location of the storm in the gulf, no ships will have issues with ports. Carnival’s vessels sailing in/out of Galveston and New Orleans may have a bumpy ride though.
Texas is starting to feel the effects [...]

Carnival
As stated before the Carnival Glory will alter its itinerary to skip St. Maarten today and Grand Turk will be called at tomorrow.
Royal Caribbean
The Adventure of the Seas will possibly call in Dominica instead of Antigua. I say possibly because its one of those “play-it-by-ear” situations.

Update 10:54 pm: Updates are in Bold.
Hurricane Jimena is currently sitting off the Mexican coast in the pacific Ocean threatening a direct hit on Cabo san Lucas. As Jimena sits there, she is prompting several I itinerary changes. Lets take a look:
Carnival
Carnival Splendor will be staying close to California by replacing its calls with Catalina Island [...]

Here is the latest map from the National Hurricane Center. All ships have sailed their current altered routes and there have been an additional few changes:

Princess Cruises Crown Princess skipped Newport yester and is in boston today. It will resume its normal schedule from here.
Holland America’s Eurodam replaced Prince Edward Island with a call in Gaspe, Quebec. [...]