TIPS ON NUCLEAR SURVIVAL
A nuclear attack is most likely to occur at night for the following reason. The EMP effect during the day goes like this. First off they have to be very accurate. A 1-megaton burst at 10 miles will affect an area 100 miles away for up to 3 hours. That same burst at 60 miles will affect up to 600 miles away for 2 to 19 minutes. The effect can last for 19min to 3 hours and will affect guidance systems. At night time the affect lasts for 1 minute.
You don't want to be near large antennae like pieces of metal either. Rail lines, power lines, conduits and ducts are also bad. The affect can penetrate up to 100 feet deep.
I got that from the Principles of Protection, U.S. Handbook of NBC Weapon Fundamentals and Shelter Design Standards. It can be purchased from the civil defense; The American Civil Defense Association (TACDA) is a non-profit organization.
Now from a book I read many years ago about living through a nuclear war: here is how you package electronics so they will survive along with you. Wrap them separately in alternating layers of cloth and foil, making sure that the foil is not in contact with the article in any way. This provides for a conductor to catch the stray electrons before they get a chance to ruin all of the nice things you got for just such an adventure.