I live in North Myrtle. We are expecting 7”. I believe your wind forecast is a bit excessive, we are expecting nothing above 40mph gusts on Saturday. It has been really dry over the last couple of weeks, so the courses will likely be open on Sunday, “playable” depends on your definition. They will be wet and obviously, CPO. There will be casual water, plugged tee shots and washed out bunkers. They will recover pretty quickly thereafter, and will likely be carts in fairways by late next week.
Here’s the authority on Grand Strand weather:
https://www.facebook.com/EdPiotrowskiWPDE
Where is your tee time Sunday?