While they may work with an individual here or there depending on circumstances, I don't recall
DCL being particularly lenient with cancellations due to prior hurricanes
that did not have direct impact on the port or cruise timing. Which is most hurricanes. We won't know if this one will have such impact until maybe tomorrow or even Wednesday/Thursday. If the port is closed thus making the next cruise depart late (like next day late), then yes DCL allows changes/cancellations. But if the port is open and the cruise is expected to go out as scheduled, one needs to have
travel insurance if desiring to cancel. And as gets reported here frequently, the DCL offered insurance does not cover flight-related issues unless the flights were purchased through DCL.