Map of nuclear fallout distribution after a potential nuclear attack on the United States. Looks to be mapping length of fallout after a day or two based on common weather trajectories.
Source: Risks and Hazards: A State By State Guide FEMA-196 (September 1990). FEMA publication.
Map of nuclear fallout distribution after a potential nuclear attack on the United States. Looks to be mapping length of fallout after a day or two based on common weather trajectories. Image credited to FEMA. Originally based on image from h