Island H2O Live! has posted on its website that it will be closed Sunday 9/1/19 and Monday 9/2/19 due to Hurricane Dorian. The park is also due to be closed on Tuesday and Wednesday as part of regular seasonal closures, so it is expected to reopen on Thursday 9/5/19 according to its website.
All closures are, of course, subject to change as the storm progresses, so you are encouraged to check an attraction’s website before planning to visit.