The weather page has been updated - no Check in on Thursday.
"Partially used multi-day theme park tickets with a validity window impacted by closure due to Hurricane Ian will be automatically extended to allow use of the remaining unused ticket days through September 30, 2023. In order to enter a park, both a park reservation and valid ticket for the same park on the same date is required.
For the safety of our Guests and Cast Members, all Guests including our Disney Vacation Club Members must check in to our resorts on Sept. 28, by 3 p.m. Guests may reschedule their trip or cancel their stay with us; any customary cancellation fees will be waived. Check in will not be accepted on Thurs Sept 29."
In that case I'd consider cancelling. Local stations are predicting up to 20" of rain in the Orlando area. Major flooding will result.