2003 Lincoln Town Car; water leak into front passenger side floor

[qualified-merc]

We have had a few good thunderstorms. right now the lincoln is outside on the driveway; yesterday noticed the front passenger floor board carpet was wet. I got out my trusty rainbow vacuum cleaner and pulled quite a bit of water out of the front passenger side floorboard. If anyone knows the Rainbow D4 SE vacuum cleaner, then you know the water removing abilities of the machine. I then drove around with the windows opened to help dry it out.

Last night we had another bad rain storm so I can't wait to see how much water is in the floorboard. My plan in the short term is to put the merc outside so I can park the lincoln in the garage for the time being. All that said, would anyone have any ideas where to start to track down this water leak?

all input is appreciated....