Not good. An intact Superdome roof was supposed to be proof against 130mph winds, which should be sufficient since the storm is weakening as it contacts land and NO is on the left side. I'd try to find a perimeter wall...
Somebody asked an official at the Superdome yesterday if the structure could handle the wind. The guy just said, "I don't know."
I believe the Superdome has leaked before and been patched. Bet the leak is where it was patched before. Just a guess, though.
The building is some 200 feet high. The winds at higher elevations are significantly more intense than ground level.