In prepping, we generally define our prepping levels by the scales of the potential crisis. For example, Jack Spirko at The Survival Podcast created a Disaster Probability Matrix, that begins with the assumption that the larger scale and the deeper the severity of a crisis, the less likely it is to happen. Simply put, you are more likely to become unemployed than to be forced to deal with after effects of a nuclear war. Spirko urges those who listen to his podcast to prepare for the "normal" stuff first, then gradually scale preparations up to be ready for a large scale man-made or natural disaster.
Toward that end, many preppers feel that one of the worst case scenarios we face is either a natural or man-made electromagnetic pulse (EMP) that would disable the electrical grid of the United States and render many cars, airplanes and other everyday products dependent upon electricity and computer control useless. The Blaze has published a short primer video on the danger of an EMP event and its effects on the United States. It focuses on the use of a nuclear weapon to create the EMP, but EMPs can also be generated by the sun. Take a look and understand what "worst case scenario" really means.