Not much else to be said, except that by "now" I mean 10 minutes ago. I'd hit the road quickly because where I work 12' of water means Tsunami. We live ~300 ft higher in elevation so once home I'd just tune in and watch the chaos from a distance. I would probably top off the fuel tank on the way home.

Now if getting off the island looked to be iffy due to traffic and everyone else getting the word first, I'd empty my truck's supplies to the upper floor where I work and prepare to camp out. The building can handle it and the second floor is at 20'.

12' in 1 hour in my location.

I would pack up my gear / anything I could get as much as I could... go up my hill until I'm 12' up (not too far it's steep) and then establish a new "home" until water went down.

It's funny you specified 12'... during our last really big flood, that was how much water was sitting on top of the asphalt of Interstate 5 in front of Walmart... some of it in WalMart. It really put a crimp in travel.