Last Monday (the 15th) was a windy and rainy day and the Mount did not leave the dock. I assume all the daytime cruises were cancelled. By the evening the weather had improved some and they did go out for the dinner cruise.
Members of the Mount's staff can confirm this but it seems like severe weather like a hurricane would cause them to cancel their cruises and put on some extra lines.
You can see on the
Anchor Marine CAM if the Mount is out or in at the Weirs.