Something occurred to me last night, if you HAD to leave your safe in place and with guns inside why not run a bead of caulking around any non-waterproof seams?? The door, any penetrations where power comes through to keep water out would be better than doing nothing. The question is, do you have the equipment to take these measures?? A caulking gun and a few tubes of quality caulk should do the trick....
You could always dig the caulking out after the event has passed but it would be better than opening the door and seeing water start flowing out.......
You could always dig the caulking out after the event has passed but it would be better than opening the door and seeing water start flowing out.......