I went up on the roof a few minutes ago to check things out. We've got about an inch and a half of water, but the drainage seems to be doing all right. It's gusty up there, and there's lots of rain coming down. Visibility is maybe 1 km, at the most (on a clear day it's around 15 km I'd guess). It's pretty epic up there. 

Standing on the roof of an apartment building in the middle of a typhoon is pretty invigorating, really.