When you ask about SHTF scenarios, I think more about stuff that would result in a societal meltdown. Natural disasters like tornados and earthquakes don't seem to create that effect unless your society is already on the edge (like New Orleans) or your local government is very corrupt (like New Orleans). Most of Indiana doesn't fall into that category. Tornados don't cause societal break down here. Quakes don't seem to do it in CA. I think of these, along with flooding as more basic disaster prep, not SHTF, which I equate more to TEOTWAWKI. Different kind of prep.
A nuke might actually cause people to pull together similar to the 9/11 attacks.
My vote for what would most likely cause something most resembling (what I think of as) a SHTF scenario would be a financial collapse. It happened in Argentina recently with some effects that would have survival implications (like skyrocketing crime). Google "FerFAL" and you can read about his experiences during the Argentina situation (this will bring up bits and pieces from a number of web sites that may need to be put together to get the full picture).
A nuke might actually cause people to pull together similar to the 9/11 attacks.
My vote for what would most likely cause something most resembling (what I think of as) a SHTF scenario would be a financial collapse. It happened in Argentina recently with some effects that would have survival implications (like skyrocketing crime). Google "FerFAL" and you can read about his experiences during the Argentina situation (this will bring up bits and pieces from a number of web sites that may need to be put together to get the full picture).