Oh yeah - keep notes, a log of your actions and those of others. You and HR will need them to to cover your potential liability. Make sure every medical procedure and response gets logged by whoever is in charge of that, and consolidate that with yours when you can finally go home. As a learning experience this would be a good one, and worth reviewing at a post mortem meeting when you present to management a plan for emergency preparedness. If they are so unprepared as to strand employees in the workplace with an approaching blizzard, turning to you for last ditch assistance, they will really need to re-think their training and preparations for the next incident. That, or you should re-think your continued employment by such a short-sighted employer.