Now comes my speculation, the US GØvt will have a false flag emp over either part of the mid Atlantic or that pesky Fransisco area.
Such an attack would take out much of Southern Canada and Northern Mexico and even some South American countries might be affected. That is if one trusts the numbers being bandied about....the thing is the effects would be uneven...some places badly damaged ,other places not even scratched due to varied geological and manmade features. The attack would have to be done at night to maximize the effect as the magnetic field is thicker on the night side due to the influence of the solar particles on the day side which thins out the field on the day side while thickening it on the night side. The solar particle effects themselves might dampen an emp effect on the day side due to phase cancellations...ect.