Just keep an eye on their social media channels. They’ll likely update if they’re not opening. But unless it’s actively thundering, the rides should be open.
Going into the peak summer season, it's pretty safe to assume the park will be open rain or shine unless there's actual flooding because it rained for a week straight.
That said, I won't be surprised to see them shuttering the waterpark more often than in past years due to weather. (see: today)
Check back Tuesday to laugh when I eat these words after we get six inches over the weekend.