To answer the question in the title of your thread ... WHAT YOU HAVE NOW:E
I really have no idea, but the other suggestions to get some off ASAP safely would be prudent and you might consider pics and keeping a record of what you did so if in the future any insurance comes into play you can show what you did to try and mitigate any damages that might happen. After all that not much else you can do and I really feel for all you up there and feel TRULY BLESSED not to have to endure what is facing you. I was going to college back in '69 near downtown when Chicago was shut down with just 3' overnight so I can appreciate somewhat what you all might be going thru. We had snow piled up against one side of our Frat house 12' high blocking the exit door on that side.
Be safe and warm up there:C
Larry