by Michael X, Survival Blog:

Hypothetically, (of course), assume for a moment that the proverbial fan has been hit. Now you have three days….or two weeks….or two months…until the consequences of the event hit where you are. Good luck guessing how long it takes to hit you. Are you as ready as you can be? Are you sure? How do you know?

How and when it hits you, whatever it may be, may be based on three key things: the type/cause of disaster, your proximity to the disaster or populated areas, and the stability of your systems (electricity, water, fuel, and human support systems).