Once a general outline and direction of the fallout is determined, disseminating this information to citizens sheltering-in-place would soon follow, by means of loudspeaker, radio, cell phone etc., with a "Fallout App" containing maps for smart phones being regarded as an area of interest so that survivors don't inadvertently evacuate downwind further into harm's way. A number of questions the affected public are likely to have after a nuclear detonation have been compiled and pre-answered to help communications in the immediate aftermath.