I found out the hard way that typhoon Luis brought enough rain in addition to its strong winds. I spent about an hour and a half in the small hours of the night during the typhoon, unblocking a drain cover and mopping up the water that had entered through our sliding door. Rain water entered because the outside area had become flooded as a result of the clogged drain cover caused by debris swept up by the rain water.
I was finally able to keep the drain cover unclogged after several desperate tries. Mopping up the floor was done more quickly than I thought I'd be able to, with the help of the easy squeeze dry mop and two electric fans at full power. I still have to find a way to keep the drain cover unblocked, and I think I have an idea, but at least, next time a typhoon hits, I'll know better.