The big problem with creating sets of contingency plans to address different types of emergency situations is that disasters often do not follow the assumptions upon which such plans are based.
As I write this, parts of the east coast of the United States are trying to recover from extensive damage caused by high winds and torrential rains roughly one week ago. The direct result of the storms was large numbers of people and businesses that lost electrical power due to damaged trees breaking transmission lines.
A contingency plan for removing the downed trees, replacing damaged electrical poles, restringing electrical lines, and restoring power exists, I'm sure. It may or may not, however, have addressed the difficult of getting to some of the areas that are affected by road damage or flooded roads as a result of the rains. And I'm sure the plans didn't figure in record-setting high temperatures for multiple consecutive days, which has certainly made the working conditions for repair crews much more difficult!
Plans are important and needed, but we need to understand that Mother Nature can be bigger than any plan when she wants to be...