Here's one of the shelters the Mexican government opened... Truth in advertising would be 'last known location' - if the glass shards don't kill you or flying debris coming through the large openings or the walls falling over in 235 mph gusts, the water will likely finish you off.
Surprised windows aren’t covered....the winds alone could smash thru those windows!
It would be smarter to remove the windows, bulldoze earth up against the walls, and bunker down.
Even with the windows boarded up that building is not a safe place in a Cat 5 storm . That overhang on the roof is a major wind catcher . I would not want to have to shelter in there .