Its still rare to get more than 3 foot in single day but it happens. 18 inches isn't so uncommon. They have a group of civilians that have nice 4x4's and they will take medical personnel etc to work in the event of a bad storm. My agency keeps an informal list of who has the modified 4x4's and will ask those to pick up people and take them in.

We get it done. Then we find places for everyone to stay even if it is a locker room or a briefing room.