Sorry to hear this happened on your cruise. That is a bummer.
We were on the 7/30 Eastern on the Magic and went to
Castaway Cay on 2/5 (the day after you were supposed to be there), and the evening and night before (so on 2/4), it was SO windy and stormy while we were at sea heading up to Castaway Cay and probably the roughest I've experienced on a
Disney Cruise, so that same storm must have been at Castaway Cay on 2/4. The wind was blowing so hard that the ship was tilting sideways (not severely, but tilting enough that we totally noticed it).
It was very windy on 2/5 at Castaway Cay (especially windy in the morning), and they cancelled a lot of shore excursions (happened to cancel the shore excursion we had booked), but they refunded us, which was nice. The shore excursion we had booked was Parasailing for our son, and I think I would have been a nervous wreck seeing my son parasail in the wind we were having on the island! So, I think the cancellations of the shore excursions was a good call.
Hopefully you can book another cruise and make it to Castaway Cay the next time.
yes, you never know what Mother Nature will bring... just have to roll with the puches, I think, when it comes to weather.