That's a good place to be, I'll add a Me Too. While I like thinking through these scenarios, there's something a little stilted about them if you can't account for your *actual, real world* preparations, rather than assume the worst and improvise throughout. Unforecasted blizzard is very remote here, but something similar like a dirty bomb is a possibility that would require an enforced stay. In our building we have a cafeteria, vending machines, and a decent stock of emergency supplies: meds, blankets, 72 hours water for 350 people @ 1 gal a day - in an emergency all we need is someone from Security to open the container for us, but frankly the right bolt cutter (like the one in my car trunk - hmm, should move that into my office) will do in a pinch.

Two story building, lots of PCs, servers and air ventilation. I would move everyone down from the second story and work to tape up the vents and reduce air circulation. Lots of windows that could shatter in a near blast, with lots of casualties as a result. Better check on the stock of kerlix and 4X4s. Lots of interior, windowless offices and conference rooms to occupy.

Honestly though Martin, I had thought that in the event of a dirty bomb, our best option was to move away from ground zero (away, and up wind) as quickly as possible, and hopefully await decontamination? Although if we have casualties from flying glass, I can understand hunkering down and waiting for rescue / wounded evac, and minimizing the infiltration of radioactive fallout by putting stories and material above you and restricting air flow. I miss the days when my office was located below the technical library, my first task was to tip over the stacks and put as much of that paper between me and the fallout.