Nuclear Explosion

Another one of the those oh well it was a good life situations, this one is actually survivable assuming you are out of the blast radius. Of course it goes without saying, but if you have warning, take cover, preferably underground. If you are in an exposed area, hit the ground and cover your head as soon as you see the blast (dont run..) as it could take up to 30 seconds for the shockwave to reach you. Speaking of the flash, dont look at it. It will blind you guaranteed. Once the initial blast has occurred, flee at your own risk. Remember, there will be gridlock and depending on the direction of the wind that radiation is coming for you. If you have a good hiding spot (underground) your best bet could be to wait for a rescue.