In that scenario, it throws a red flag into bug out phase. Cell towers should have battery backup so for all cell and also internet service to also be out then it is not just a drunk hitting a pole or a blown transformer. If getting out is your plan (some it's not which is fine) then recongnizing the early and right time to go will be key. You have an hour of you are lucky. After that the govt will have things blocked off and activated that you don't want to have to bipass
Driving a semi, my worst nightmare is to have an EMP attack while I'm in Connecticut at about -5° and have to actually use my "walk home bag". It will suck.