How To Manage Training Disruptions

A couple of weeks ago, a blizzard basically brought New England to a standstill, and Cape Cod was hit even harder- no power and heat for three days.  So when power was restored, it got us thinking about not only weather-related training disruptions, but also ANY training disruptions.  From illness to injury to just life- what do you do when you can't train consistently and how do you get back on track safely?