Here is the Chicago Survival Guide for the Nuclear Holocaust:
IF YOU ARE NEAR THE BLAST:
- Turn away and close and cover your eyes to prevent damage to your sight
- Drop to the ground face down and place your hands under your body
- Remain flat until the heat and two shock waves have passed
IF YOU ARE OUTSIDE WHEN THE BLAST OCCURS:
- Find something to cover your mouth and nose, such as a scarf, handkerchief, or other cloth
- Remove any dust from your clothes by brushing, shaking, and wiping in a ventilated area. However, cover your mouth and nose while you do this.
- Move to a shelter, basement, or other underground area, preferably located away from the direction that the wind is blowing.
- Remove clothing since it may be contaminated. If possible, take a shower, wash your hair, and change clothes before you enter the shelter.
IF YOU ARE ALREADY IN A SHELTER OR BASEMENT:
- Cover your mouth and nose with a facemask or other material (such as a scarf or handkerchief) until you know that the fallout cloud has passed.
- Shut off ventilation systems and seal doors or windows. After the fallout cloud has passed, unseal the doors and windows to allow some air circulation.
- Stay inside until authorities say it is safe to come out
- Listen to the local radio or television for information and advice. Authorities may direct you to stay in your shelter or evacuate to a safer place.
- If you must go out, cover your mouth and nose with a damp towel
- Use stored food and drinking water. Do not eat local fresh food or drink water from open water supplies.
- Clean and cover any open wounds on your body
This infographic form the CDC pretty much sums it up - we are all going to feel like hammered shit if this happens! Good luck and God bless!