The corner of Wisconsin Avenue (MD-355) and Montgomery Ave has been taking a beating the past few rainstorms. Water really pools up in the rightmost northbound lane of MD-355 and you have to drive through it if you are in that lane or if you are crossing on Montgomery Avenue.
This is not the first storm that this has happened, there is a storm drain right on the corner that is clearly clogged. They have put up a "High Water" sign but haven't yet cleared the drain. I saw someone with a large video camera taking video of this corner so it will probably show up on the news at some point.
So far, I've been a bit disappointed in this storm. They promised torrential rain and so far we have only seen heavy rain. The good news is that Bethesda hasn't been hammered with falling trees and power outages.