Hi Pam. I just checked the JetBlue Web site, and as of now your flight is still on for tomorrow.
I'm not familiar with the terms of the travel insurance policy offered through Royal Caribbean. Many policies will reimburse you for any expenses you incur in catching up to the ship at the next port. Some will also reimburse you for the cruise itself -- but you do need to check the fine print as every policy is different.
When traveling tomorrow, have phone numbers on hand for the following: Royal Caribbean, Jet Blue, your travel agent. A good friend of mine missed his ship last year (it was on a day like today) and had to meet the ship in Nassau, its first port of call. The airline rebooked him on a flight for the next day, and his TA made his overnight hotel arrangements in Nassau.
I'll be thinking of you tomorrow. This weather is supposed to turn to rain tonight, so I would think you'd be OK.